1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, VEC(tree,gc) **);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1207 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1209 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1210 && TREE_CODE (olddecl) != TEMPLATE_DECL
1211 && check_raw_literal_operator (olddecl))
1212 error ("literal operator template %q+D conflicts with"
1213 " raw literal operator %qD", newdecl, olddecl);
1214 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1215 && TREE_CODE (olddecl) == TEMPLATE_DECL
1216 && check_raw_literal_operator (newdecl))
1217 error ("raw literal operator %q+D conflicts with"
1218 " literal operator template %qD", newdecl, olddecl);
1221 if (DECL_P (olddecl)
1222 && TREE_CODE (newdecl) == FUNCTION_DECL
1223 && TREE_CODE (olddecl) == FUNCTION_DECL
1224 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1226 if (DECL_DECLARED_INLINE_P (newdecl)
1227 && DECL_UNINLINABLE (newdecl)
1228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 /* Already warned elsewhere. */;
1230 else if (DECL_DECLARED_INLINE_P (olddecl)
1231 && DECL_UNINLINABLE (olddecl)
1232 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1233 /* Already warned. */;
1234 else if (DECL_DECLARED_INLINE_P (newdecl)
1235 && DECL_UNINLINABLE (olddecl)
1236 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1238 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1240 warning (OPT_Wattributes, "previous declaration of %q+D "
1241 "with attribute noinline", olddecl);
1243 else if (DECL_DECLARED_INLINE_P (olddecl)
1244 && DECL_UNINLINABLE (newdecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared with "
1248 "attribute noinline", newdecl);
1249 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1254 /* Check for redeclaration and other discrepancies. */
1255 if (TREE_CODE (olddecl) == FUNCTION_DECL
1256 && DECL_ARTIFICIAL (olddecl))
1258 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1259 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1261 /* Avoid warnings redeclaring built-ins which have not been
1262 explicitly declared. */
1263 if (DECL_ANTICIPATED (olddecl))
1266 /* If you declare a built-in or predefined function name as static,
1267 the old definition is overridden, but optionally warn this was a
1268 bad choice of name. */
1269 if (! TREE_PUBLIC (newdecl))
1271 warning (OPT_Wshadow,
1272 DECL_BUILT_IN (olddecl)
1273 ? G_("shadowing built-in function %q#D")
1274 : G_("shadowing library function %q#D"), olddecl);
1275 /* Discard the old built-in function. */
1278 /* If the built-in is not ansi, then programs can override
1279 it even globally without an error. */
1280 else if (! DECL_BUILT_IN (olddecl))
1281 warning (0, "library function %q#D redeclared as non-function %q#D",
1285 error ("declaration of %q#D", newdecl);
1286 error ("conflicts with built-in declaration %q#D",
1291 else if (!types_match)
1293 /* Avoid warnings redeclaring built-ins which have not been
1294 explicitly declared. */
1295 if (DECL_ANTICIPATED (olddecl))
1297 /* Deal with fileptr_type_node. FILE type is not known
1298 at the time we create the builtins. */
1301 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1302 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1307 else if (TREE_VALUE (t2) == fileptr_type_node)
1309 tree t = TREE_VALUE (t1);
1311 if (TREE_CODE (t) == POINTER_TYPE
1312 && TYPE_NAME (TREE_TYPE (t))
1313 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1314 == get_identifier ("FILE")
1315 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1317 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1320 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1321 types_match = decls_match (newdecl, olddecl);
1323 return duplicate_decls (newdecl, olddecl,
1325 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1328 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1331 else if ((DECL_EXTERN_C_P (newdecl)
1332 && DECL_EXTERN_C_P (olddecl))
1333 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1336 /* A near match; override the builtin. */
1338 if (TREE_PUBLIC (newdecl))
1340 warning (0, "new declaration %q#D", newdecl);
1341 warning (0, "ambiguates built-in declaration %q#D",
1345 warning (OPT_Wshadow,
1346 DECL_BUILT_IN (olddecl)
1347 ? G_("shadowing built-in function %q#D")
1348 : G_("shadowing library function %q#D"), olddecl);
1351 /* Discard the old built-in function. */
1354 /* Replace the old RTL to avoid problems with inlining. */
1355 COPY_DECL_RTL (newdecl, olddecl);
1357 /* Even if the types match, prefer the new declarations type for
1358 built-ins which have not been explicitly declared, for
1359 exception lists, etc... */
1360 else if (DECL_IS_BUILTIN (olddecl))
1362 tree type = TREE_TYPE (newdecl);
1363 tree attribs = (*targetm.merge_type_attributes)
1364 (TREE_TYPE (olddecl), type);
1366 type = cp_build_type_attribute_variant (type, attribs);
1367 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1370 /* If a function is explicitly declared "throw ()", propagate that to
1371 the corresponding builtin. */
1372 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1373 && DECL_ANTICIPATED (olddecl)
1374 && TREE_NOTHROW (newdecl)
1375 && !TREE_NOTHROW (olddecl))
1377 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1378 tree tmpdecl = builtin_decl_explicit (fncode);
1379 if (tmpdecl && tmpdecl != olddecl && types_match)
1380 TREE_NOTHROW (tmpdecl) = 1;
1383 /* Whether or not the builtin can throw exceptions has no
1384 bearing on this declarator. */
1385 TREE_NOTHROW (olddecl) = 0;
1387 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1389 /* If a builtin function is redeclared as `static', merge
1390 the declarations, but make the original one static. */
1391 DECL_THIS_STATIC (olddecl) = 1;
1392 TREE_PUBLIC (olddecl) = 0;
1394 /* Make the old declaration consistent with the new one so
1395 that all remnants of the builtin-ness of this function
1396 will be banished. */
1397 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1398 COPY_DECL_RTL (newdecl, olddecl);
1401 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 /* C++ Standard, 3.3, clause 4:
1404 "[Note: a namespace name or a class template name must be unique
1405 in its declarative region (7.3.2, clause 14). ]" */
1406 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1407 && TREE_CODE (newdecl) != NAMESPACE_DECL
1408 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1409 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1410 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1413 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1414 && TREE_CODE (newdecl) != TYPE_DECL)
1415 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1416 && TREE_CODE (olddecl) != TYPE_DECL))
1418 /* We do nothing special here, because C++ does such nasty
1419 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1420 get shadowed, and know that if we need to find a TYPE_DECL
1421 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1422 slot of the identifier. */
1426 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1428 || (TREE_CODE (olddecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1433 error ("%q#D redeclared as different kind of symbol", newdecl);
1434 if (TREE_CODE (olddecl) == TREE_LIST)
1435 olddecl = TREE_VALUE (olddecl);
1436 error ("previous declaration of %q+#D", olddecl);
1438 return error_mark_node;
1440 else if (!types_match)
1442 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1443 /* These are certainly not duplicate declarations; they're
1444 from different scopes. */
1447 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1449 /* The name of a class template may not be declared to refer to
1450 any other template, class, function, object, namespace, value,
1451 or type in the same scope. */
1452 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1453 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1455 error ("declaration of template %q#D", newdecl);
1456 error ("conflicts with previous declaration %q+#D", olddecl);
1458 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1459 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1460 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1461 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1462 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1463 DECL_TEMPLATE_PARMS (olddecl))
1464 /* Template functions can be disambiguated by
1466 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1467 TREE_TYPE (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1474 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1476 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1478 error ("declaration of C function %q#D conflicts with",
1480 error ("previous declaration %q+#D here", olddecl);
1483 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1484 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1486 error ("new declaration %q#D", newdecl);
1487 error ("ambiguates old declaration %q+#D", olddecl);
1488 return error_mark_node;
1495 error ("conflicting declaration %q#D", newdecl);
1496 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1497 return error_mark_node;
1500 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1501 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1502 && (!DECL_TEMPLATE_INFO (newdecl)
1503 || (DECL_TI_TEMPLATE (newdecl)
1504 != DECL_TI_TEMPLATE (olddecl))))
1505 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1506 && (!DECL_TEMPLATE_INFO (olddecl)
1507 || (DECL_TI_TEMPLATE (olddecl)
1508 != DECL_TI_TEMPLATE (newdecl))))))
1509 /* It's OK to have a template specialization and a non-template
1510 with the same type, or to have specializations of two
1511 different templates with the same type. Note that if one is a
1512 specialization, and the other is an instantiation of the same
1513 template, that we do not exit at this point. That situation
1514 can occur if we instantiate a template class, and then
1515 specialize one of its methods. This situation is valid, but
1516 the declarations must be merged in the usual way. */
1518 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1519 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1520 && !DECL_USE_TEMPLATE (newdecl))
1521 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1522 && !DECL_USE_TEMPLATE (olddecl))))
1523 /* One of the declarations is a template instantiation, and the
1524 other is not a template at all. That's OK. */
1526 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1528 /* In [namespace.alias] we have:
1530 In a declarative region, a namespace-alias-definition can be
1531 used to redefine a namespace-alias declared in that declarative
1532 region to refer only to the namespace to which it already
1535 Therefore, if we encounter a second alias directive for the same
1536 alias, we can just ignore the second directive. */
1537 if (DECL_NAMESPACE_ALIAS (newdecl)
1538 && (DECL_NAMESPACE_ALIAS (newdecl)
1539 == DECL_NAMESPACE_ALIAS (olddecl)))
1541 /* [namespace.alias]
1543 A namespace-name or namespace-alias shall not be declared as
1544 the name of any other entity in the same declarative region.
1545 A namespace-name defined at global scope shall not be
1546 declared as the name of any other entity in any global scope
1548 error ("declaration of namespace %qD conflicts with", newdecl);
1549 error ("previous declaration of namespace %q+D here", olddecl);
1550 return error_mark_node;
1554 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1557 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1558 if (DECL_NAME (olddecl) != NULL_TREE)
1559 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1560 ? G_("%q+#D previously defined here")
1561 : G_("%q+#D previously declared here"), olddecl);
1562 return error_mark_node;
1564 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1565 && DECL_INITIAL (olddecl) != NULL_TREE
1566 && !prototype_p (TREE_TYPE (olddecl))
1567 && prototype_p (TREE_TYPE (newdecl)))
1569 /* Prototype decl follows defn w/o prototype. */
1570 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1571 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1572 "follows non-prototype definition here");
1574 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1575 || TREE_CODE (olddecl) == VAR_DECL)
1576 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1579 If two declarations of the same function or object
1580 specify different linkage-specifications ..., the program
1581 is ill-formed.... Except for functions with C++ linkage,
1582 a function declaration without a linkage specification
1583 shall not precede the first linkage specification for
1584 that function. A function can be declared without a
1585 linkage specification after an explicit linkage
1586 specification has been seen; the linkage explicitly
1587 specified in the earlier declaration is not affected by
1588 such a function declaration.
1590 DR 563 raises the question why the restrictions on
1591 functions should not also apply to objects. Older
1592 versions of G++ silently ignore the linkage-specification
1600 which is clearly wrong. Therefore, we now treat objects
1602 if (current_lang_depth () == 0)
1604 /* There is no explicit linkage-specification, so we use
1605 the linkage from the previous declaration. */
1606 if (!DECL_LANG_SPECIFIC (newdecl))
1607 retrofit_lang_decl (newdecl);
1608 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1612 error ("previous declaration of %q+#D with %qL linkage",
1613 olddecl, DECL_LANGUAGE (olddecl));
1614 error ("conflicts with new declaration with %qL linkage",
1615 DECL_LANGUAGE (newdecl));
1619 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1621 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1623 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1624 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1627 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1630 for (; t1 && t1 != void_list_node;
1631 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1632 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1634 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1637 permerror (input_location, "default argument given for parameter %d of %q#D",
1639 permerror (input_location, "after previous specification in %q+#D", olddecl);
1643 error ("default argument given for parameter %d of %q#D",
1645 error ("after previous specification in %q+#D",
1652 /* Do not merge an implicit typedef with an explicit one. In:
1656 typedef class A A __attribute__ ((foo));
1658 the attribute should apply only to the typedef. */
1659 if (TREE_CODE (olddecl) == TYPE_DECL
1660 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1661 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1664 /* If new decl is `static' and an `extern' was seen previously,
1666 warn_extern_redeclared_static (newdecl, olddecl);
1668 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1669 return error_mark_node;
1671 /* We have committed to returning 1 at this point. */
1672 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1674 /* Now that functions must hold information normally held
1675 by field decls, there is extra work to do so that
1676 declaration information does not get destroyed during
1678 if (DECL_VINDEX (olddecl))
1679 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1680 if (DECL_CONTEXT (olddecl))
1681 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1682 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1683 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1684 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1685 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1686 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1687 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1688 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1689 SET_OVERLOADED_OPERATOR_CODE
1690 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1691 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1693 /* Optionally warn about more than one declaration for the same
1694 name, but don't warn about a function declaration followed by a
1696 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1697 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1698 /* Don't warn about extern decl followed by definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1700 /* Don't warn about friends, let add_friend take care of it. */
1701 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1703 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1704 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1707 if (DECL_DELETED_FN (newdecl))
1709 error ("deleted definition of %qD", newdecl);
1710 error ("after previous declaration %q+D", olddecl);
1712 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1715 /* Deal with C++: must preserve virtual function table size. */
1716 if (TREE_CODE (olddecl) == TYPE_DECL)
1718 tree newtype = TREE_TYPE (newdecl);
1719 tree oldtype = TREE_TYPE (olddecl);
1721 if (newtype != error_mark_node && oldtype != error_mark_node
1722 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1723 CLASSTYPE_FRIEND_CLASSES (newtype)
1724 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1726 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1729 /* Copy all the DECL_... slots specified in the new decl
1730 except for any that we copy here from the old type. */
1731 DECL_ATTRIBUTES (newdecl)
1732 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1734 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1738 old_result = DECL_TEMPLATE_RESULT (olddecl);
1739 new_result = DECL_TEMPLATE_RESULT (newdecl);
1740 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1741 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1742 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1743 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1745 DECL_ATTRIBUTES (old_result)
1746 = (*targetm.merge_decl_attributes) (old_result, new_result);
1748 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1750 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1751 && DECL_INITIAL (new_result))
1753 if (DECL_INITIAL (old_result))
1754 DECL_UNINLINABLE (old_result) = 1;
1756 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1757 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1758 DECL_NOT_REALLY_EXTERN (old_result)
1759 = DECL_NOT_REALLY_EXTERN (new_result);
1760 DECL_INTERFACE_KNOWN (old_result)
1761 = DECL_INTERFACE_KNOWN (new_result);
1762 DECL_DECLARED_INLINE_P (old_result)
1763 = DECL_DECLARED_INLINE_P (new_result);
1764 DECL_DISREGARD_INLINE_LIMITS (old_result)
1765 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1770 DECL_DECLARED_INLINE_P (old_result)
1771 |= DECL_DECLARED_INLINE_P (new_result);
1772 DECL_DISREGARD_INLINE_LIMITS (old_result)
1773 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1774 check_redeclaration_exception_specification (newdecl, olddecl);
1778 /* If the new declaration is a definition, update the file and
1779 line information on the declaration, and also make
1780 the old declaration the same definition. */
1781 if (DECL_INITIAL (new_result) != NULL_TREE)
1783 DECL_SOURCE_LOCATION (olddecl)
1784 = DECL_SOURCE_LOCATION (old_result)
1785 = DECL_SOURCE_LOCATION (newdecl);
1786 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1787 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1790 DECL_ARGUMENTS (old_result)
1791 = DECL_ARGUMENTS (new_result);
1792 for (parm = DECL_ARGUMENTS (old_result); parm;
1793 parm = DECL_CHAIN (parm))
1794 DECL_CONTEXT (parm) = old_result;
1803 /* Automatically handles default parameters. */
1804 tree oldtype = TREE_TYPE (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 maybe_instantiate_noexcept (olddecl);
1810 /* Merge the data types specified in the two decls. */
1811 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1813 /* If merge_types produces a non-typedef type, just use the old type. */
1814 if (TREE_CODE (newdecl) == TYPE_DECL
1815 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1818 if (TREE_CODE (newdecl) == VAR_DECL)
1820 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1821 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1822 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1823 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1824 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1825 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1827 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1828 if (DECL_LANG_SPECIFIC (olddecl)
1829 && CP_DECL_THREADPRIVATE_P (olddecl))
1831 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1832 if (!DECL_LANG_SPECIFIC (newdecl))
1833 retrofit_lang_decl (newdecl);
1835 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1836 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1840 /* Do this after calling `merge_types' so that default
1841 parameters don't confuse us. */
1842 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 check_redeclaration_exception_specification (newdecl, olddecl);
1844 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 check_default_args (newdecl);
1849 /* Lay the type out, unless already done. */
1850 if (! same_type_p (newtype, oldtype)
1851 && TREE_TYPE (newdecl) != error_mark_node
1852 && !(processing_template_decl && uses_template_parms (newdecl)))
1853 layout_type (TREE_TYPE (newdecl));
1855 if ((TREE_CODE (newdecl) == VAR_DECL
1856 || TREE_CODE (newdecl) == PARM_DECL
1857 || TREE_CODE (newdecl) == RESULT_DECL
1858 || TREE_CODE (newdecl) == FIELD_DECL
1859 || TREE_CODE (newdecl) == TYPE_DECL)
1860 && !(processing_template_decl && uses_template_parms (newdecl)))
1861 layout_decl (newdecl, 0);
1863 /* Merge the type qualifiers. */
1864 if (TREE_READONLY (newdecl))
1865 TREE_READONLY (olddecl) = 1;
1866 if (TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (olddecl) = 1;
1868 if (TREE_NOTHROW (newdecl))
1869 TREE_NOTHROW (olddecl) = 1;
1871 /* Merge deprecatedness. */
1872 if (TREE_DEPRECATED (newdecl))
1873 TREE_DEPRECATED (olddecl) = 1;
1875 /* Preserve function specific target and optimization options */
1876 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1878 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1879 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1880 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1881 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1883 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1885 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1889 /* Merge the initialization information. */
1890 if (DECL_INITIAL (newdecl) == NULL_TREE
1891 && DECL_INITIAL (olddecl) != NULL_TREE)
1893 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1898 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1902 /* Merge the section attribute.
1903 We want to issue an error if the sections conflict but that must be
1904 done later in decl_attributes since we are called before attributes
1906 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1907 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1912 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1915 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1916 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1917 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1918 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1919 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1920 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1921 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1922 /* Keep the old RTL. */
1923 COPY_DECL_RTL (olddecl, newdecl);
1925 else if (TREE_CODE (newdecl) == VAR_DECL
1926 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1928 /* Keep the old RTL. We cannot keep the old RTL if the old
1929 declaration was for an incomplete object and the new
1930 declaration is not since many attributes of the RTL will
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1939 /* Clean out any memory we had of the old declaration. */
1940 tree oldstatic = value_member (olddecl, static_aggregates);
1942 TREE_VALUE (oldstatic) = error_mark_node;
1944 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1945 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1946 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1947 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1950 /* Merge the storage class information. */
1951 merge_weak (newdecl, olddecl);
1953 if (DECL_ONE_ONLY (olddecl))
1954 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1956 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1957 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1959 if (! DECL_EXTERNAL (olddecl))
1960 DECL_EXTERNAL (newdecl) = 0;
1962 new_template_info = NULL_TREE;
1963 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1965 bool new_redefines_gnu_inline = false;
1967 if (new_defines_function
1968 && ((DECL_INTERFACE_KNOWN (olddecl)
1969 && TREE_CODE (olddecl) == FUNCTION_DECL)
1970 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1971 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1972 == FUNCTION_DECL))))
1976 if (TREE_CODE (fn) == TEMPLATE_DECL)
1977 fn = DECL_TEMPLATE_RESULT (olddecl);
1979 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1982 if (!new_redefines_gnu_inline)
1984 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1985 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1986 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1988 DECL_TEMPLATE_INSTANTIATED (newdecl)
1989 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1990 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1992 /* If the OLDDECL is an instantiation and/or specialization,
1993 then the NEWDECL must be too. But, it may not yet be marked
1994 as such if the caller has created NEWDECL, but has not yet
1995 figured out that it is a redeclaration. */
1996 if (!DECL_USE_TEMPLATE (newdecl))
1997 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1999 /* Don't really know how much of the language-specific
2000 values we should copy from old to new. */
2001 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2002 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2003 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2004 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2006 if (LANG_DECL_HAS_MIN (newdecl))
2008 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2009 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2010 if (DECL_TEMPLATE_INFO (newdecl))
2011 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2012 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2014 /* Only functions have these fields. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL
2016 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2018 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2019 olddecl_friend = DECL_FRIEND_P (olddecl);
2020 hidden_friend = (DECL_ANTICIPATED (olddecl)
2021 && DECL_HIDDEN_FRIEND_P (olddecl)
2022 && newdecl_is_friend);
2023 DECL_BEFRIENDING_CLASSES (newdecl)
2024 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2025 DECL_BEFRIENDING_CLASSES (olddecl));
2026 /* DECL_THUNKS is only valid for virtual functions,
2027 otherwise it is a DECL_FRIEND_CONTEXT. */
2028 if (DECL_VIRTUAL_P (newdecl))
2029 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2031 /* Only variables have this field. */
2032 else if (TREE_CODE (newdecl) == VAR_DECL
2033 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2034 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 /* Merge parameter attributes. */
2042 tree oldarg, newarg;
2043 for (oldarg = DECL_ARGUMENTS(olddecl),
2044 newarg = DECL_ARGUMENTS(newdecl);
2046 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2047 DECL_ATTRIBUTES (newarg)
2048 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2049 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2052 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2053 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2055 /* If newdecl is not a specialization, then it is not a
2056 template-related function at all. And that means that we
2057 should have exited above, returning 0. */
2058 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2060 if (DECL_ODR_USED (olddecl))
2061 /* From [temp.expl.spec]:
2063 If a template, a member template or the member of a class
2064 template is explicitly specialized then that
2065 specialization shall be declared before the first use of
2066 that specialization that would cause an implicit
2067 instantiation to take place, in every translation unit in
2068 which such a use occurs. */
2069 error ("explicit specialization of %qD after first use",
2072 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2074 /* Don't propagate visibility from the template to the
2075 specialization here. We'll do that in determine_visibility if
2077 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2079 /* [temp.expl.spec/14] We don't inline explicit specialization
2080 just because the primary template says so. */
2082 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2083 the always_inline attribute. */
2084 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2085 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2087 if (DECL_DECLARED_INLINE_P (newdecl))
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2090 DECL_ATTRIBUTES (newdecl)
2091 = remove_attribute ("always_inline",
2092 DECL_ATTRIBUTES (newdecl));
2095 else if (new_defines_function && DECL_INITIAL (olddecl))
2097 /* Never inline re-defined extern inline functions.
2098 FIXME: this could be better handled by keeping both
2099 function as separate declarations. */
2100 DECL_UNINLINABLE (newdecl) = 1;
2104 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2105 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2107 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2109 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2110 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2112 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2113 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2114 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2115 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2118 /* Preserve abstractness on cloned [cd]tors. */
2119 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2121 /* Update newdecl's parms to point at olddecl. */
2122 for (parm = DECL_ARGUMENTS (newdecl); parm;
2123 parm = DECL_CHAIN (parm))
2124 DECL_CONTEXT (parm) = olddecl;
2128 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2129 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2130 COPY_DECL_RTL (newdecl, olddecl);
2132 if (! types_match || new_defines_function)
2134 /* These need to be copied so that the names are available.
2135 Note that if the types do match, we'll preserve inline
2136 info and other bits, but if not, we won't. */
2137 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2138 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2140 if (new_defines_function)
2141 /* If defining a function declared with other language
2142 linkage, use the previously declared language linkage. */
2143 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2144 else if (types_match)
2146 /* If redeclaring a builtin function, and not a definition,
2147 it stays built in. */
2148 if (DECL_BUILT_IN (olddecl))
2150 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2151 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2152 /* If we're keeping the built-in definition, keep the rtl,
2153 regardless of declaration matches. */
2154 COPY_DECL_RTL (olddecl, newdecl);
2155 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2157 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2160 /* If a compatible prototype of these builtin functions
2161 is seen, assume the runtime implements it with the
2162 expected semantics. */
2163 case BUILT_IN_STPCPY:
2164 if (builtin_decl_explicit_p (fncode))
2165 set_builtin_decl_implicit_p (fncode, true);
2173 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2174 /* Don't clear out the arguments if we're just redeclaring a
2176 if (DECL_ARGUMENTS (olddecl))
2177 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2180 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2181 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2183 /* Now preserve various other info from the definition. */
2184 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2185 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2186 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2187 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2189 /* Warn about conflicting visibility specifications. */
2190 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2191 && DECL_VISIBILITY_SPECIFIED (newdecl)
2192 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2194 warning_at (input_location, OPT_Wattributes,
2195 "%q+D: visibility attribute ignored because it", newdecl);
2196 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2197 "conflicts with previous declaration here");
2199 /* Choose the declaration which specified visibility. */
2200 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2202 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2203 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2205 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2206 so keep this behavior. */
2207 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2209 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2210 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2212 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2213 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2214 if (TREE_CODE (newdecl) == FIELD_DECL)
2215 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2217 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2218 with that from NEWDECL below. */
2219 if (DECL_LANG_SPECIFIC (olddecl))
2221 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2222 != DECL_LANG_SPECIFIC (newdecl));
2223 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2226 /* Merge the USED information. */
2227 if (TREE_USED (olddecl))
2228 TREE_USED (newdecl) = 1;
2229 else if (TREE_USED (newdecl))
2230 TREE_USED (olddecl) = 1;
2231 if (TREE_CODE (newdecl) == VAR_DECL)
2233 if (DECL_READ_P (olddecl))
2234 DECL_READ_P (newdecl) = 1;
2235 else if (DECL_READ_P (newdecl))
2236 DECL_READ_P (olddecl) = 1;
2238 if (DECL_PRESERVE_P (olddecl))
2239 DECL_PRESERVE_P (newdecl) = 1;
2240 else if (DECL_PRESERVE_P (newdecl))
2241 DECL_PRESERVE_P (olddecl) = 1;
2243 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 function_size = sizeof (struct tree_decl_common);
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 function_size - sizeof (struct tree_common));
2253 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2254 (char *) newdecl + sizeof (struct tree_decl_common),
2255 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2256 if (new_template_info)
2257 /* If newdecl is a template instantiation, it is possible that
2258 the following sequence of events has occurred:
2260 o A friend function was declared in a class template. The
2261 class template was instantiated.
2263 o The instantiation of the friend declaration was
2264 recorded on the instantiation list, and is newdecl.
2266 o Later, however, instantiate_class_template called pushdecl
2267 on the newdecl to perform name injection. But, pushdecl in
2268 turn called duplicate_decls when it discovered that another
2269 declaration of a global function with the same name already
2272 o Here, in duplicate_decls, we decided to clobber newdecl.
2274 If we're going to do that, we'd better make sure that
2275 olddecl, and not newdecl, is on the list of
2276 instantiations so that if we try to do the instantiation
2277 again we won't get the clobbered declaration. */
2278 reregister_specialization (newdecl,
2284 size_t size = tree_code_size (TREE_CODE (olddecl));
2285 memcpy ((char *) olddecl + sizeof (struct tree_common),
2286 (char *) newdecl + sizeof (struct tree_common),
2287 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2288 switch (TREE_CODE (olddecl))
2298 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2299 (char *) newdecl + sizeof (struct tree_decl_common),
2300 size - sizeof (struct tree_decl_common)
2301 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2305 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2306 (char *) newdecl + sizeof (struct tree_decl_common),
2307 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2308 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2312 DECL_UID (olddecl) = olddecl_uid;
2314 DECL_FRIEND_P (olddecl) = 1;
2317 DECL_ANTICIPATED (olddecl) = 1;
2318 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2321 /* NEWDECL contains the merged attribute lists.
2322 Update OLDDECL to be the same. */
2323 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2325 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2326 so that encode_section_info has a chance to look at the new decl
2327 flags and attributes. */
2328 if (DECL_RTL_SET_P (olddecl)
2329 && (TREE_CODE (olddecl) == FUNCTION_DECL
2330 || (TREE_CODE (olddecl) == VAR_DECL
2331 && TREE_STATIC (olddecl))))
2332 make_decl_rtl (olddecl);
2334 /* The NEWDECL will no longer be needed. Because every out-of-class
2335 declaration of a member results in a call to duplicate_decls,
2336 freeing these nodes represents in a significant savings. */
2342 /* Return zero if the declaration NEWDECL is valid
2343 when the declaration OLDDECL (assumed to be for the same name)
2344 has already been seen.
2345 Otherwise return an error message format string with a %s
2346 where the identifier should go. */
2349 redeclaration_error_message (tree newdecl, tree olddecl)
2351 if (TREE_CODE (newdecl) == TYPE_DECL)
2353 /* Because C++ can put things into name space for free,
2354 constructs like "typedef struct foo { ... } foo"
2355 would look like an erroneous redeclaration. */
2356 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2359 return G_("redefinition of %q#D");
2361 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2363 /* If this is a pure function, its olddecl will actually be
2364 the original initialization to `0' (which we force to call
2365 abort()). Don't complain about redefinition in this case. */
2366 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2367 && DECL_INITIAL (olddecl) == NULL_TREE)
2370 /* If both functions come from different namespaces, this is not
2371 a redeclaration - this is a conflict with a used function. */
2372 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2373 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2374 && ! decls_match (olddecl, newdecl))
2375 return G_("%qD conflicts with used function");
2377 /* We'll complain about linkage mismatches in
2378 warn_extern_redeclared_static. */
2380 /* Defining the same name twice is no good. */
2381 if (DECL_INITIAL (olddecl) != NULL_TREE
2382 && DECL_INITIAL (newdecl) != NULL_TREE)
2384 if (DECL_NAME (olddecl) == NULL_TREE)
2385 return G_("%q#D not declared in class");
2386 else if (!GNU_INLINE_P (olddecl)
2387 || GNU_INLINE_P (newdecl))
2388 return G_("redefinition of %q#D");
2391 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2393 bool olda = GNU_INLINE_P (olddecl);
2394 bool newa = GNU_INLINE_P (newdecl);
2399 return G_("%q+D redeclared inline with "
2400 "%<gnu_inline%> attribute");
2402 return G_("%q+D redeclared inline without "
2403 "%<gnu_inline%> attribute");
2409 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2413 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2415 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2416 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2417 return G_("redefinition of %q#D");
2421 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2422 || (DECL_TEMPLATE_RESULT (newdecl)
2423 == DECL_TEMPLATE_RESULT (olddecl)))
2426 nt = DECL_TEMPLATE_RESULT (newdecl);
2427 if (DECL_TEMPLATE_INFO (nt))
2428 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2429 ot = DECL_TEMPLATE_RESULT (olddecl);
2430 if (DECL_TEMPLATE_INFO (ot))
2431 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2432 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2433 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2434 return G_("redefinition of %q#D");
2436 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2438 bool olda = GNU_INLINE_P (ot);
2439 bool newa = GNU_INLINE_P (nt);
2444 return G_("%q+D redeclared inline with "
2445 "%<gnu_inline%> attribute");
2447 return G_("%q+D redeclared inline without "
2448 "%<gnu_inline%> attribute");
2452 /* Core issue #226 (C++0x):
2454 If a friend function template declaration specifies a
2455 default template-argument, that declaration shall be a
2456 definition and shall be the only declaration of the
2457 function template in the translation unit. */
2458 if ((cxx_dialect != cxx98)
2459 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2460 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2461 /*is_primary=*/1, /*is_partial=*/0,
2462 /*is_friend_decl=*/2))
2463 return G_("redeclaration of friend %q#D "
2464 "may not have default template arguments");
2468 else if (TREE_CODE (newdecl) == VAR_DECL
2469 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2470 && (! DECL_LANG_SPECIFIC (olddecl)
2471 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2472 || DECL_THREAD_LOCAL_P (newdecl)))
2474 /* Only variables can be thread-local, and all declarations must
2475 agree on this property. */
2476 if (DECL_THREAD_LOCAL_P (newdecl))
2477 return G_("thread-local declaration of %q#D follows "
2478 "non-thread-local declaration");
2480 return G_("non-thread-local declaration of %q#D follows "
2481 "thread-local declaration");
2483 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2485 /* The objects have been declared at namespace scope. If either
2486 is a member of an anonymous union, then this is an invalid
2487 redeclaration. For example:
2493 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2494 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2495 return G_("redeclaration of %q#D");
2496 /* If at least one declaration is a reference, there is no
2497 conflict. For example:
2503 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2505 /* Reject two definitions. */
2506 return G_("redefinition of %q#D");
2510 /* Objects declared with block scope: */
2511 /* Reject two definitions, and reject a definition
2512 together with an external reference. */
2513 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2514 return G_("redeclaration of %q#D");
2519 /* Hash and equality functions for the named_label table. */
2522 named_label_entry_hash (const void *data)
2524 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2525 return DECL_UID (ent->label_decl);
2529 named_label_entry_eq (const void *a, const void *b)
2531 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2532 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2533 return ent_a->label_decl == ent_b->label_decl;
2536 /* Create a new label, named ID. */
2539 make_label_decl (tree id, int local_p)
2541 struct named_label_entry *ent;
2545 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2547 DECL_CONTEXT (decl) = current_function_decl;
2548 DECL_MODE (decl) = VOIDmode;
2549 C_DECLARED_LABEL_FLAG (decl) = local_p;
2551 /* Say where one reference is to the label, for the sake of the
2552 error if it is not defined. */
2553 DECL_SOURCE_LOCATION (decl) = input_location;
2555 /* Record the fact that this identifier is bound to this label. */
2556 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2558 /* Create the label htab for the function on demand. */
2560 named_labels = htab_create_ggc (13, named_label_entry_hash,
2561 named_label_entry_eq, NULL);
2563 /* Record this label on the list of labels used in this function.
2564 We do this before calling make_label_decl so that we get the
2565 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2566 ent = ggc_alloc_cleared_named_label_entry ();
2567 ent->label_decl = decl;
2569 slot = htab_find_slot (named_labels, ent, INSERT);
2570 gcc_assert (*slot == NULL);
2576 /* Look for a label named ID in the current function. If one cannot
2577 be found, create one. (We keep track of used, but undefined,
2578 labels, and complain about them at the end of a function.) */
2581 lookup_label_1 (tree id)
2585 /* You can't use labels at global scope. */
2586 if (current_function_decl == NULL_TREE)
2588 error ("label %qE referenced outside of any function", id);
2592 /* See if we've already got this label. */
2593 decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2597 decl = make_label_decl (id, /*local_p=*/0);
2601 /* Wrapper for lookup_label_1. */
2604 lookup_label (tree id)
2607 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2608 ret = lookup_label_1 (id);
2609 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2613 /* Declare a local label named ID. */
2616 declare_local_label (tree id)
2619 cp_label_binding *bind;
2621 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2622 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2623 bind = VEC_safe_push (cp_label_binding, gc,
2624 current_binding_level->shadowed_labels, NULL);
2625 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2627 decl = make_label_decl (id, /*local_p=*/1);
2633 /* Returns nonzero if it is ill-formed to jump past the declaration of
2634 DECL. Returns 2 if it's also a real problem. */
2637 decl_jump_unsafe (tree decl)
2639 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2640 with automatic storage duration is not in scope to a point where it is
2641 in scope is ill-formed unless the variable has scalar type, class type
2642 with a trivial default constructor and a trivial destructor, a
2643 cv-qualified version of one of these types, or an array of one of the
2644 preceding types and is declared without an initializer (8.5). */
2645 tree type = TREE_TYPE (decl);
2647 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2648 || type == error_mark_node)
2651 type = strip_array_types (type);
2653 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2654 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2657 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2663 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2666 identify_goto (tree decl, const location_t *locus)
2669 permerror (input_location, "jump to label %qD", decl);
2671 permerror (input_location, "jump to case label");
2673 permerror (*locus, " from here");
2676 /* Check that a single previously seen jump to a newly defined label
2677 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2678 the jump context; NAMES are the names in scope in LEVEL at the jump
2679 context; LOCUS is the source position of the jump or 0. Returns
2680 true if all is well. */
2683 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2684 bool exited_omp, const location_t *locus)
2686 cp_binding_level *b;
2687 bool identified = false, saw_eh = false, saw_omp = false;
2691 identify_goto (decl, locus);
2692 error (" exits OpenMP structured block");
2693 identified = saw_omp = true;
2696 for (b = current_binding_level; b ; b = b->level_chain)
2698 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2700 for (new_decls = b->names; new_decls != old_decls;
2701 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2702 : TREE_CHAIN (new_decls)))
2704 int problem = decl_jump_unsafe (new_decls);
2710 identify_goto (decl, locus);
2714 error (" crosses initialization of %q+#D", new_decls);
2716 permerror (input_location, " enters scope of %q+#D which has "
2717 "non-trivial destructor", new_decls);
2722 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2726 identify_goto (decl, locus);
2729 if (b->kind == sk_try)
2730 error (" enters try block");
2732 error (" enters catch block");
2735 if (b->kind == sk_omp && !saw_omp)
2739 identify_goto (decl, locus);
2742 error (" enters OpenMP structured block");
2751 check_previous_goto (tree decl, struct named_label_use_entry *use)
2753 check_previous_goto_1 (decl, use->binding_level,
2754 use->names_in_scope, use->in_omp_scope,
2755 &use->o_goto_locus);
2759 check_switch_goto (cp_binding_level* level)
2761 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2764 /* Check that a new jump to a label DECL is OK. Called by
2765 finish_goto_stmt. */
2768 check_goto (tree decl)
2770 struct named_label_entry *ent, dummy;
2771 bool saw_catch = false, identified = false;
2775 /* We can't know where a computed goto is jumping.
2776 So we assume that it's OK. */
2777 if (TREE_CODE (decl) != LABEL_DECL)
2780 /* We didn't record any information about this label when we created it,
2781 and there's not much point since it's trivial to analyze as a return. */
2782 if (decl == cdtor_label)
2785 dummy.label_decl = decl;
2786 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2787 gcc_assert (ent != NULL);
2789 /* If the label hasn't been defined yet, defer checking. */
2790 if (! DECL_INITIAL (decl))
2792 struct named_label_use_entry *new_use;
2794 /* Don't bother creating another use if the last goto had the
2795 same data, and will therefore create the same set of errors. */
2797 && ent->uses->names_in_scope == current_binding_level->names)
2800 new_use = ggc_alloc_named_label_use_entry ();
2801 new_use->binding_level = current_binding_level;
2802 new_use->names_in_scope = current_binding_level->names;
2803 new_use->o_goto_locus = input_location;
2804 new_use->in_omp_scope = false;
2806 new_use->next = ent->uses;
2807 ent->uses = new_use;
2811 if (ent->in_try_scope || ent->in_catch_scope
2812 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2814 permerror (input_location, "jump to label %q+D", decl);
2815 permerror (input_location, " from here");
2819 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2821 int u = decl_jump_unsafe (bad);
2823 if (u > 1 && DECL_ARTIFICIAL (bad))
2825 /* Can't skip init of __exception_info. */
2826 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2830 error (" skips initialization of %q+#D", bad);
2832 permerror (input_location, " enters scope of %q+#D which has "
2833 "non-trivial destructor", bad);
2836 if (ent->in_try_scope)
2837 error (" enters try block");
2838 else if (ent->in_catch_scope && !saw_catch)
2839 error (" enters catch block");
2841 if (ent->in_omp_scope)
2842 error (" enters OpenMP structured block");
2843 else if (flag_openmp)
2845 cp_binding_level *b;
2846 for (b = current_binding_level; b ; b = b->level_chain)
2848 if (b == ent->binding_level)
2850 if (b->kind == sk_omp)
2854 permerror (input_location, "jump to label %q+D", decl);
2855 permerror (input_location, " from here");
2858 error (" exits OpenMP structured block");
2865 /* Check that a return is ok wrt OpenMP structured blocks.
2866 Called by finish_return_stmt. Returns true if all is well. */
2869 check_omp_return (void)
2871 cp_binding_level *b;
2872 for (b = current_binding_level; b ; b = b->level_chain)
2873 if (b->kind == sk_omp)
2875 error ("invalid exit from OpenMP structured block");
2878 else if (b->kind == sk_function_parms)
2883 /* Define a label, specifying the location in the source file.
2884 Return the LABEL_DECL node for the label. */
2887 define_label_1 (location_t location, tree name)
2889 struct named_label_entry *ent, dummy;
2890 cp_binding_level *p;
2893 decl = lookup_label (name);
2895 dummy.label_decl = decl;
2896 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2897 gcc_assert (ent != NULL);
2899 /* After labels, make any new cleanups in the function go into their
2900 own new (temporary) binding contour. */
2901 for (p = current_binding_level;
2902 p->kind != sk_function_parms;
2904 p->more_cleanups_ok = 0;
2906 if (name == get_identifier ("wchar_t"))
2907 permerror (input_location, "label named wchar_t");
2909 if (DECL_INITIAL (decl) != NULL_TREE)
2911 error ("duplicate label %qD", decl);
2912 return error_mark_node;
2916 struct named_label_use_entry *use;
2918 /* Mark label as having been defined. */
2919 DECL_INITIAL (decl) = error_mark_node;
2920 /* Say where in the source. */
2921 DECL_SOURCE_LOCATION (decl) = location;
2923 ent->binding_level = current_binding_level;
2924 ent->names_in_scope = current_binding_level->names;
2926 for (use = ent->uses; use ; use = use->next)
2927 check_previous_goto (decl, use);
2934 /* Wrapper for define_label_1. */
2937 define_label (location_t location, tree name)
2940 timevar_start (TV_NAME_LOOKUP);
2941 ret = define_label_1 (location, name);
2942 timevar_stop (TV_NAME_LOOKUP);
2949 cp_binding_level *level;
2950 struct cp_switch *next;
2951 /* The SWITCH_STMT being built. */
2953 /* A splay-tree mapping the low element of a case range to the high
2954 element, or NULL_TREE if there is no high element. Used to
2955 determine whether or not a new case label duplicates an old case
2956 label. We need a tree, rather than simply a hash table, because
2957 of the GNU case range extension. */
2961 /* A stack of the currently active switch statements. The innermost
2962 switch statement is on the top of the stack. There is no need to
2963 mark the stack for garbage collection because it is only active
2964 during the processing of the body of a function, and we never
2965 collect at that point. */
2967 static struct cp_switch *switch_stack;
2969 /* Called right after a switch-statement condition is parsed.
2970 SWITCH_STMT is the switch statement being parsed. */
2973 push_switch (tree switch_stmt)
2975 struct cp_switch *p = XNEW (struct cp_switch);
2976 p->level = current_binding_level;
2977 p->next = switch_stack;
2978 p->switch_stmt = switch_stmt;
2979 p->cases = splay_tree_new (case_compare, NULL, NULL);
2986 struct cp_switch *cs = switch_stack;
2987 location_t switch_location;
2989 /* Emit warnings as needed. */
2990 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2991 if (!processing_template_decl)
2992 c_do_switch_warnings (cs->cases, switch_location,
2993 SWITCH_STMT_TYPE (cs->switch_stmt),
2994 SWITCH_STMT_COND (cs->switch_stmt));
2996 splay_tree_delete (cs->cases);
2997 switch_stack = switch_stack->next;
3001 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3002 condition. Note that if TYPE and VALUE are already integral we don't
3003 really do the conversion because the language-independent
3004 warning/optimization code will work better that way. */
3007 case_conversion (tree type, tree value)
3009 if (value == NULL_TREE)
3012 if (cxx_dialect >= cxx0x
3013 && (SCOPED_ENUM_P (type)
3014 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3016 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3017 type = type_promotes_to (type);
3018 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3020 return cxx_constant_value (value);
3023 /* Note that we've seen a definition of a case label, and complain if this
3024 is a bad place for one. */
3027 finish_case_label (location_t loc, tree low_value, tree high_value)
3030 cp_binding_level *p;
3033 if (processing_template_decl)
3037 /* For templates, just add the case label; we'll do semantic
3038 analysis at instantiation-time. */
3039 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3040 return add_stmt (build_case_label (low_value, high_value, label));
3043 /* Find the condition on which this switch statement depends. */
3044 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3045 if (cond && TREE_CODE (cond) == TREE_LIST)
3046 cond = TREE_VALUE (cond);
3048 if (!check_switch_goto (switch_stack->level))
3049 return error_mark_node;
3051 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3053 low_value = case_conversion (type, low_value);
3054 high_value = case_conversion (type, high_value);
3056 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3057 low_value, high_value);
3059 /* After labels, make any new cleanups in the function go into their
3060 own new (temporary) binding contour. */
3061 for (p = current_binding_level;
3062 p->kind != sk_function_parms;
3064 p->more_cleanups_ok = 0;
3069 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3072 typename_hash (const void* k)
3075 const_tree const t = (const_tree) k;
3077 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3078 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3083 typedef struct typename_info {
3091 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3092 really of type `typename_info*' */
3095 typename_compare (const void * k1, const void * k2)
3097 const_tree const t1 = (const_tree) k1;
3098 const typename_info *const t2 = (const typename_info *) k2;
3100 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3101 && TYPE_CONTEXT (t1) == t2->scope
3102 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3103 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3104 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3107 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3108 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3110 Returns the new TYPENAME_TYPE. */
3112 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3115 build_typename_type (tree context, tree name, tree fullname,
3116 enum tag_types tag_type)
3124 if (typename_htab == NULL)
3125 typename_htab = htab_create_ggc (61, &typename_hash,
3126 &typename_compare, NULL);
3128 ti.scope = FROB_CONTEXT (context);
3130 ti.template_id = fullname;
3131 ti.enum_p = tag_type == enum_type;
3132 ti.class_p = (tag_type == class_type
3133 || tag_type == record_type
3134 || tag_type == union_type);
3135 hash = (htab_hash_pointer (ti.scope)
3136 ^ htab_hash_pointer (ti.name));
3138 /* See if we already have this type. */
3139 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3144 /* Build the TYPENAME_TYPE. */
3145 t = cxx_make_type (TYPENAME_TYPE);
3146 TYPE_CONTEXT (t) = ti.scope;
3147 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3148 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3149 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3151 /* Build the corresponding TYPE_DECL. */
3152 d = build_decl (input_location, TYPE_DECL, name, t);
3153 TYPE_NAME (TREE_TYPE (d)) = d;
3154 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3155 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3156 DECL_ARTIFICIAL (d) = 1;
3158 /* Store it in the hash table. */
3161 /* TYPENAME_TYPEs must always be compared structurally, because
3162 they may or may not resolve down to another type depending on
3163 the currently open classes. */
3164 SET_TYPE_STRUCTURAL_EQUALITY (t);
3170 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3171 provided to name the type. Returns an appropriate type, unless an
3172 error occurs, in which case error_mark_node is returned. If we
3173 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3174 return that, rather than the _TYPE it corresponds to, in other
3175 cases we look through the type decl. If TF_ERROR is set, complain
3176 about errors, otherwise be quiet. */
3179 make_typename_type (tree context, tree name, enum tag_types tag_type,
3180 tsubst_flags_t complain)
3186 if (name == error_mark_node
3187 || context == NULL_TREE
3188 || context == error_mark_node)
3189 return error_mark_node;
3193 if (!(TYPE_LANG_SPECIFIC (name)
3194 && (CLASSTYPE_IS_TEMPLATE (name)
3195 || CLASSTYPE_USE_TEMPLATE (name))))
3196 name = TYPE_IDENTIFIER (name);
3198 /* Create a TEMPLATE_ID_EXPR for the type. */
3199 name = build_nt (TEMPLATE_ID_EXPR,
3200 CLASSTYPE_TI_TEMPLATE (name),
3201 CLASSTYPE_TI_ARGS (name));
3203 else if (TREE_CODE (name) == TYPE_DECL)
3204 name = DECL_NAME (name);
3208 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3210 name = TREE_OPERAND (name, 0);
3211 if (TREE_CODE (name) == TEMPLATE_DECL)
3212 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3213 else if (TREE_CODE (name) == OVERLOAD)
3215 error ("%qD is not a type", name);
3216 return error_mark_node;
3219 if (TREE_CODE (name) == TEMPLATE_DECL)
3221 error ("%qD used without template parameters", name);
3222 return error_mark_node;
3224 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3225 gcc_assert (TYPE_P (context));
3227 if (!MAYBE_CLASS_TYPE_P (context))
3229 if (complain & tf_error)
3230 error ("%q#T is not a class", context);
3231 return error_mark_node;
3234 /* When the CONTEXT is a dependent type, NAME could refer to a
3235 dependent base class of CONTEXT. But look inside it anyway
3236 if CONTEXT is a currently open scope, in case it refers to a
3237 member of the current instantiation or a non-dependent base;
3238 lookup will stop when we hit a dependent base. */
3239 if (!dependent_scope_p (context))
3240 /* We should only set WANT_TYPE when we're a nested typename type.
3241 Then we can give better diagnostics if we find a non-type. */
3242 t = lookup_field (context, name, 2, /*want_type=*/true);
3246 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3247 return build_typename_type (context, name, fullname, tag_type);
3249 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3253 if (complain & tf_error)
3254 error (want_template ? G_("no class template named %q#T in %q#T")
3255 : G_("no type named %q#T in %q#T"), name, context);
3256 return error_mark_node;
3259 /* Pull out the template from an injected-class-name (or multiple). */
3261 t = maybe_get_template_decl_from_type_decl (t);
3263 if (TREE_CODE (t) == TREE_LIST)
3265 if (complain & tf_error)
3267 error ("lookup of %qT in %qT is ambiguous", name, context);
3268 print_candidates (t);
3270 return error_mark_node;
3273 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3275 if (complain & tf_error)
3276 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3278 return error_mark_node;
3280 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3282 if (complain & tf_error)
3283 error ("%<typename %T::%D%> names %q#T, which is not a type",
3285 return error_mark_node;
3288 if (complain & tf_error)
3289 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3291 /* If we are currently parsing a template and if T is a typedef accessed
3292 through CONTEXT then we need to remember and check access of T at
3293 template instantiation time. */
3294 add_typedef_to_current_template_for_access_check (t, context, input_location);
3297 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3299 /*entering_scope=*/0,
3300 tf_warning_or_error | tf_user);
3302 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3308 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3309 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3310 in which case error_mark_node is returned.
3312 If PARM_LIST is non-NULL, also make sure that the template parameter
3313 list of TEMPLATE_DECL matches.
3315 If COMPLAIN zero, don't complain about any errors that occur. */
3318 make_unbound_class_template (tree context, tree name, tree parm_list,
3319 tsubst_flags_t complain)
3325 name = TYPE_IDENTIFIER (name);
3326 else if (DECL_P (name))
3327 name = DECL_NAME (name);
3328 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3330 if (!dependent_type_p (context)
3331 || currently_open_class (context))
3333 tree tmpl = NULL_TREE;
3335 if (MAYBE_CLASS_TYPE_P (context))
3336 tmpl = lookup_field (context, name, 0, false);
3338 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3339 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3341 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3343 if (complain & tf_error)
3344 error ("no class template named %q#T in %q#T", name, context);
3345 return error_mark_node;
3349 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3351 if (complain & tf_error)
3353 error ("template parameters do not match template");
3354 error ("%q+D declared here", tmpl);
3356 return error_mark_node;
3359 if (complain & tf_error)
3360 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3365 /* Build the UNBOUND_CLASS_TEMPLATE. */
3366 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3367 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3368 TREE_TYPE (t) = NULL_TREE;
3369 SET_TYPE_STRUCTURAL_EQUALITY (t);
3371 /* Build the corresponding TEMPLATE_DECL. */
3372 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3373 TYPE_NAME (TREE_TYPE (d)) = d;
3374 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3375 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3376 DECL_ARTIFICIAL (d) = 1;
3377 DECL_TEMPLATE_PARMS (d) = parm_list;
3384 /* Push the declarations of builtin types into the namespace.
3385 RID_INDEX is the index of the builtin type in the array
3386 RID_POINTERS. NAME is the name used when looking up the builtin
3387 type. TYPE is the _TYPE node for the builtin type. */
3390 record_builtin_type (enum rid rid_index,
3394 tree rname = NULL_TREE, tname = NULL_TREE;
3395 tree tdecl = NULL_TREE;
3397 if ((int) rid_index < (int) RID_MAX)
3398 rname = ridpointers[(int) rid_index];
3400 tname = get_identifier (name);
3402 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3403 eliminated. Built-in types should not be looked up name; their
3404 names are keywords that the parser can recognize. However, there
3405 is code in c-common.c that uses identifier_global_value to look
3406 up built-in types by name. */
3409 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3410 DECL_ARTIFICIAL (tdecl) = 1;
3411 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3417 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3418 DECL_ARTIFICIAL (tdecl) = 1;
3420 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3423 if (!TYPE_NAME (type))
3424 TYPE_NAME (type) = tdecl;
3427 debug_hooks->type_decl (tdecl, 0);
3430 /* Record one of the standard Java types.
3431 * Declare it as having the given NAME.
3432 * If SIZE > 0, it is the size of one of the integral types;
3433 * otherwise it is the negative of the size of one of the other types. */
3436 record_builtin_java_type (const char* name, int size)
3441 type = build_nonstandard_integer_type (size, 0);
3442 type = build_distinct_type_copy (type);
3444 else if (size > -32)
3447 /* "__java_char" or ""__java_boolean". */
3448 type = build_nonstandard_integer_type (-size, 1);
3449 type = build_distinct_type_copy (type);
3450 /* Get the signed type cached and attached to the unsigned type,
3451 so it doesn't get garbage-collected at "random" times,
3452 causing potential codegen differences out of different UIDs
3453 and different alias set numbers. */
3454 stype = build_nonstandard_integer_type (-size, 0);
3455 stype = build_distinct_type_copy (stype);
3456 TREE_CHAIN (type) = stype;
3457 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3460 { /* "__java_float" or ""__java_double". */
3461 type = make_node (REAL_TYPE);
3462 TYPE_PRECISION (type) = - size;
3465 record_builtin_type (RID_MAX, name, type);
3466 decl = TYPE_NAME (type);
3468 /* Suppress generate debug symbol entries for these types,
3469 since for normal C++ they are just clutter.
3470 However, push_lang_context undoes this if extern "Java" is seen. */
3471 DECL_IGNORED_P (decl) = 1;
3473 TYPE_FOR_JAVA (type) = 1;
3477 /* Push a type into the namespace so that the back ends ignore it. */
3480 record_unknown_type (tree type, const char* name)
3482 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3483 TYPE_DECL, get_identifier (name), type));
3484 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3485 DECL_IGNORED_P (decl) = 1;
3486 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3487 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3488 TYPE_ALIGN (type) = 1;
3489 TYPE_USER_ALIGN (type) = 0;
3490 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3493 /* A string for which we should create an IDENTIFIER_NODE at
3496 typedef struct predefined_identifier
3498 /* The name of the identifier. */
3499 const char *const name;
3500 /* The place where the IDENTIFIER_NODE should be stored. */
3502 /* Nonzero if this is the name of a constructor or destructor. */
3503 const int ctor_or_dtor_p;
3504 } predefined_identifier;
3506 /* Create all the predefined identifiers. */
3509 initialize_predefined_identifiers (void)
3511 const predefined_identifier *pid;
3513 /* A table of identifiers to create at startup. */
3514 static const predefined_identifier predefined_identifiers[] = {
3515 { "C++", &lang_name_cplusplus, 0 },
3516 { "C", &lang_name_c, 0 },
3517 { "Java", &lang_name_java, 0 },
3518 /* Some of these names have a trailing space so that it is
3519 impossible for them to conflict with names written by users. */
3520 { "__ct ", &ctor_identifier, 1 },
3521 { "__base_ctor ", &base_ctor_identifier, 1 },
3522 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3523 { "__dt ", &dtor_identifier, 1 },
3524 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3525 { "__base_dtor ", &base_dtor_identifier, 1 },
3526 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3527 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3528 { "nelts", &nelts_identifier, 0 },
3529 { THIS_NAME, &this_identifier, 0 },
3530 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3531 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3532 { "_vptr", &vptr_identifier, 0 },
3533 { "__vtt_parm", &vtt_parm_identifier, 0 },
3534 { "::", &global_scope_name, 0 },
3535 { "std", &std_identifier, 0 },
3539 for (pid = predefined_identifiers; pid->name; ++pid)
3541 *pid->node = get_identifier (pid->name);
3542 if (pid->ctor_or_dtor_p)
3543 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3547 /* Create the predefined scalar types of C,
3548 and some nodes representing standard constants (0, 1, (void *)0).
3549 Initialize the global binding level.
3550 Make definitions for built-in primitive functions. */
3553 cxx_init_decl_processing (void)
3556 tree void_ftype_ptr;
3558 /* Create all the identifiers we need. */
3559 initialize_predefined_identifiers ();
3561 /* Create the global variables. */
3562 push_to_top_level ();
3564 current_function_decl = NULL_TREE;
3565 current_binding_level = NULL;
3566 /* Enter the global namespace. */
3567 gcc_assert (global_namespace == NULL_TREE);
3568 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3570 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3571 TREE_PUBLIC (global_namespace) = 1;
3572 begin_scope (sk_namespace, global_namespace);
3574 if (flag_visibility_ms_compat)
3575 default_visibility = VISIBILITY_HIDDEN;
3578 current_lang_name = lang_name_c;
3580 /* Create the `std' namespace. */
3581 push_namespace (std_identifier);
3582 std_node = current_namespace;
3585 c_common_nodes_and_builtins ();
3587 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3588 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3589 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3590 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3591 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3592 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3593 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3594 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3596 integer_two_node = build_int_cst (NULL_TREE, 2);
3598 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3599 truthvalue_type_node = boolean_type_node;
3600 truthvalue_false_node = boolean_false_node;
3601 truthvalue_true_node = boolean_true_node;
3603 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3604 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3605 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3608 record_builtin_type (RID_MAX, NULL, string_type_node);
3611 delta_type_node = ptrdiff_type_node;
3612 vtable_index_type = ptrdiff_type_node;
3614 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3615 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3616 void_ftype_ptr = build_function_type_list (void_type_node,
3617 ptr_type_node, NULL_TREE);
3619 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3621 /* C++ extensions */
3623 unknown_type_node = make_node (LANG_TYPE);
3624 record_unknown_type (unknown_type_node, "unknown type");
3626 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3627 TREE_TYPE (unknown_type_node) = unknown_type_node;
3629 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3631 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3632 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3634 init_list_type_node = make_node (LANG_TYPE);
3635 record_unknown_type (init_list_type_node, "init list");
3637 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3638 record_unknown_type (dependent_lambda_return_type_node,
3639 "undeduced lambda return type");
3642 /* Make sure we get a unique function type, so we can give
3643 its pointer type a name. (This wins for gdb.) */
3644 tree vfunc_type = make_node (FUNCTION_TYPE);
3645 TREE_TYPE (vfunc_type) = integer_type_node;
3646 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3647 layout_type (vfunc_type);
3649 vtable_entry_type = build_pointer_type (vfunc_type);
3651 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3654 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3655 layout_type (vtbl_type_node);
3656 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3657 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3658 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3659 layout_type (vtbl_ptr_type_node);
3660 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3662 push_namespace (get_identifier ("__cxxabiv1"));
3663 abi_node = current_namespace;
3666 global_type_node = make_node (LANG_TYPE);
3667 record_unknown_type (global_type_node, "global type");
3670 current_lang_name = lang_name_cplusplus;
3673 tree newattrs, extvisattr;
3674 tree newtype, deltype;
3675 tree ptr_ftype_sizetype;
3679 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3680 if (cxx_dialect == cxx98)
3683 tree bad_alloc_type_node;
3684 tree bad_alloc_decl;
3686 push_namespace (std_identifier);
3687 bad_alloc_id = get_identifier ("bad_alloc");
3688 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3689 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3691 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3692 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3696 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3699 new_eh_spec = noexcept_false_spec;
3701 /* Ensure attribs.c is initialized. */
3703 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3705 newattrs = tree_cons (get_identifier ("alloc_size"),
3706 build_tree_list (NULL_TREE, integer_one_node),
3708 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3709 newtype = build_exception_variant (newtype, new_eh_spec);
3710 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3711 deltype = build_exception_variant (deltype, empty_except_spec);
3712 push_cp_library_fn (NEW_EXPR, newtype);
3713 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3714 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3715 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3717 nullptr_type_node = make_node (NULLPTR_TYPE);
3718 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3719 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3720 TYPE_UNSIGNED (nullptr_type_node) = 1;
3721 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3722 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3723 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3724 nullptr_node = build_int_cst (nullptr_type_node, 0);
3728 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3730 /* Perform other language dependent initializations. */
3731 init_class_processing ();
3732 init_rtti_processing ();
3733 init_template_processing ();
3735 if (flag_exceptions)
3736 init_exception_processing ();
3738 if (! supports_one_only ())
3741 make_fname_decl = cp_make_fname_decl;
3742 start_fname_decls ();
3744 /* Show we use EH for cleanups. */
3745 if (flag_exceptions)
3746 using_eh_for_cleanups ();
3749 /* Generate an initializer for a function naming variable from
3750 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3751 filled in with the type of the init. */
3754 cp_fname_init (const char* name, tree *type_p)
3756 tree domain = NULL_TREE;
3758 tree init = NULL_TREE;
3763 length = strlen (name);
3764 domain = build_index_type (size_int (length));
3765 init = build_string (length + 1, name);
3768 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3769 type = build_cplus_array_type (type, domain);
3774 TREE_TYPE (init) = type;
3776 init = error_mark_node;
3781 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3782 the decl, LOC is the location to give the decl, NAME is the
3783 initialization string and TYPE_DEP indicates whether NAME depended
3784 on the type of the function. We make use of that to detect
3785 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3786 at the point of first use, so we mustn't push the decl now. */
3789 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3791 const char *const name = (type_dep && processing_template_decl
3792 ? NULL : fname_as_string (type_dep));
3794 tree init = cp_fname_init (name, &type);
3795 tree decl = build_decl (loc, VAR_DECL, id, type);
3798 free (CONST_CAST (char *, name));
3800 /* As we're using pushdecl_with_scope, we must set the context. */
3801 DECL_CONTEXT (decl) = current_function_decl;
3802 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3804 TREE_STATIC (decl) = 1;
3805 TREE_READONLY (decl) = 1;
3806 DECL_ARTIFICIAL (decl) = 1;
3808 TREE_USED (decl) = 1;
3810 if (current_function_decl)
3812 cp_binding_level *b = current_binding_level;
3813 if (b->kind == sk_function_parms)
3814 return error_mark_node;
3815 while (b->level_chain->kind != sk_function_parms)
3817 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3818 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3819 LOOKUP_ONLYCONVERTING);
3823 DECL_THIS_STATIC (decl) = true;
3824 pushdecl_top_level_and_finish (decl, init);
3831 builtin_function_1 (tree decl, tree context, bool is_global)
3833 tree id = DECL_NAME (decl);
3834 const char *name = IDENTIFIER_POINTER (id);
3836 retrofit_lang_decl (decl);
3838 DECL_ARTIFICIAL (decl) = 1;
3839 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3840 SET_DECL_LANGUAGE (decl, lang_c);
3841 /* Runtime library routines are, by definition, available in an
3842 external shared object. */
3843 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3844 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3846 DECL_CONTEXT (decl) = context;
3849 pushdecl_top_level (decl);
3853 /* A function in the user's namespace should have an explicit
3854 declaration before it is used. Mark the built-in function as
3855 anticipated but not actually declared. */
3856 if (name[0] != '_' || name[1] != '_')
3857 DECL_ANTICIPATED (decl) = 1;
3858 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3860 size_t len = strlen (name);
3862 /* Treat __*_chk fortification functions as anticipated as well,
3863 unless they are __builtin_*. */
3864 if (len > strlen ("___chk")
3865 && memcmp (name + len - strlen ("_chk"),
3866 "_chk", strlen ("_chk") + 1) == 0)
3867 DECL_ANTICIPATED (decl) = 1;
3874 cxx_builtin_function (tree decl)
3876 tree id = DECL_NAME (decl);
3877 const char *name = IDENTIFIER_POINTER (id);
3878 /* All builtins that don't begin with an '_' should additionally
3879 go in the 'std' namespace. */
3882 tree decl2 = copy_node(decl);
3883 push_namespace (std_identifier);
3884 builtin_function_1 (decl2, std_node, false);
3888 return builtin_function_1 (decl, NULL_TREE, false);
3891 /* Like cxx_builtin_function, but guarantee the function is added to the global
3892 scope. This is to allow function specific options to add new machine
3893 dependent builtins when the target ISA changes via attribute((target(...)))
3894 which saves space on program startup if the program does not use non-generic
3898 cxx_builtin_function_ext_scope (tree decl)
3901 tree id = DECL_NAME (decl);
3902 const char *name = IDENTIFIER_POINTER (id);
3903 /* All builtins that don't begin with an '_' should additionally
3904 go in the 'std' namespace. */
3907 tree decl2 = copy_node(decl);
3908 push_namespace (std_identifier);
3909 builtin_function_1 (decl2, std_node, true);
3913 return builtin_function_1 (decl, NULL_TREE, true);
3916 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3917 function. Not called directly. */
3920 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3922 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3923 DECL_EXTERNAL (fn) = 1;
3924 TREE_PUBLIC (fn) = 1;
3925 DECL_ARTIFICIAL (fn) = 1;
3926 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3927 SET_DECL_LANGUAGE (fn, lang_c);
3928 /* Runtime library routines are, by definition, available in an
3929 external shared object. */
3930 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3931 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3935 /* Returns the _DECL for a library function with C linkage.
3936 We assume that such functions never throw; if this is incorrect,
3937 callers should unset TREE_NOTHROW. */
3940 build_library_fn (tree name, tree type)
3942 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3943 TREE_NOTHROW (fn) = 1;
3947 /* Returns the _DECL for a library function with C++ linkage. */
3950 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3952 tree fn = build_library_fn_1 (name, operator_code, type);
3953 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3954 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3955 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3959 /* Like build_library_fn, but takes a C string instead of an
3963 build_library_fn_ptr (const char* name, tree type)
3965 return build_library_fn (get_identifier (name), type);
3968 /* Like build_cp_library_fn, but takes a C string instead of an
3972 build_cp_library_fn_ptr (const char* name, tree type)
3974 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3977 /* Like build_library_fn, but also pushes the function so that we will
3978 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3979 may throw exceptions listed in RAISES. */
3982 push_library_fn (tree name, tree type, tree raises)
3987 type = build_exception_variant (type, raises);
3989 fn = build_library_fn (name, type);
3990 pushdecl_top_level (fn);
3994 /* Like build_cp_library_fn, but also pushes the function so that it
3995 will be found by normal lookup. */
3998 push_cp_library_fn (enum tree_code operator_code, tree type)
4000 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4005 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4009 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4013 push_void_library_fn (tree name, tree parmtypes)
4015 tree type = build_function_type (void_type_node, parmtypes);
4016 return push_library_fn (name, type, NULL_TREE);
4019 /* Like push_library_fn, but also note that this function throws
4020 and does not return. Used for __throw_foo and the like. */
4023 push_throw_library_fn (tree name, tree type)
4025 tree fn = push_library_fn (name, type, NULL_TREE);
4026 TREE_THIS_VOLATILE (fn) = 1;
4027 TREE_NOTHROW (fn) = 0;
4031 /* When we call finish_struct for an anonymous union, we create
4032 default copy constructors and such. But, an anonymous union
4033 shouldn't have such things; this function undoes the damage to the
4034 anonymous union type T.
4036 (The reason that we create the synthesized methods is that we don't
4037 distinguish `union { int i; }' from `typedef union { int i; } U'.
4038 The first is an anonymous union; the second is just an ordinary
4042 fixup_anonymous_aggr (tree t)
4046 /* Wipe out memory of synthesized methods. */
4047 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4048 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4049 TYPE_HAS_COPY_CTOR (t) = 0;
4050 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4051 TYPE_HAS_COPY_ASSIGN (t) = 0;
4052 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4054 /* Splice the implicitly generated functions out of the TYPE_METHODS
4056 q = &TYPE_METHODS (t);
4059 if (DECL_ARTIFICIAL (*q))
4060 *q = TREE_CHAIN (*q);
4062 q = &DECL_CHAIN (*q);
4065 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4066 if (TYPE_METHODS (t))
4068 tree decl = TYPE_MAIN_DECL (t);
4070 if (TREE_CODE (t) != UNION_TYPE)
4071 error_at (DECL_SOURCE_LOCATION (decl),
4072 "an anonymous struct cannot have function members");
4074 error_at (DECL_SOURCE_LOCATION (decl),
4075 "an anonymous union cannot have function members");
4078 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4079 assignment operators (because they cannot have these methods themselves).
4080 For anonymous unions this is already checked because they are not allowed
4081 in any union, otherwise we have to check it. */
4082 if (TREE_CODE (t) != UNION_TYPE)
4086 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4087 if (TREE_CODE (field) == FIELD_DECL)
4089 type = TREE_TYPE (field);
4090 if (CLASS_TYPE_P (type))
4092 if (TYPE_NEEDS_CONSTRUCTING (type))
4093 error ("member %q+#D with constructor not allowed "
4094 "in anonymous aggregate", field);
4095 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4096 error ("member %q+#D with destructor not allowed "
4097 "in anonymous aggregate", field);
4098 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4099 error ("member %q+#D with copy assignment operator "
4100 "not allowed in anonymous aggregate", field);
4106 /* Make sure that a declaration with no declarator is well-formed, i.e.
4107 just declares a tagged type or anonymous union.
4109 Returns the type declared; or NULL_TREE if none. */
4112 check_tag_decl (cp_decl_specifier_seq *declspecs)
4114 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4115 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4116 /* If a class, struct, or enum type is declared by the DECLSPECS
4117 (i.e, if a class-specifier, enum-specifier, or non-typename
4118 elaborated-type-specifier appears in the DECLSPECS),
4119 DECLARED_TYPE is set to the corresponding type. */
4120 tree declared_type = NULL_TREE;
4121 bool error_p = false;
4123 if (declspecs->multiple_types_p)
4124 error ("multiple types in one declaration");
4125 else if (declspecs->redefined_builtin_type)
4127 if (!in_system_header)
4128 permerror (input_location, "redeclaration of C++ built-in type %qT",
4129 declspecs->redefined_builtin_type);
4134 && TYPE_P (declspecs->type)
4135 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4136 && MAYBE_CLASS_TYPE_P (declspecs->type))
4137 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4138 declared_type = declspecs->type;
4139 else if (declspecs->type == error_mark_node)
4141 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4142 permerror (input_location, "declaration does not declare anything");
4143 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4145 error ("%<auto%> can only be specified for variables "
4146 "or function declarations");
4147 return error_mark_node;
4149 /* Check for an anonymous union. */
4150 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4151 && TYPE_ANONYMOUS_P (declared_type))
4153 /* 7/3 In a simple-declaration, the optional init-declarator-list
4154 can be omitted only when declaring a class (clause 9) or
4155 enumeration (7.2), that is, when the decl-specifier-seq contains
4156 either a class-specifier, an elaborated-type-specifier with
4157 a class-key (9.1), or an enum-specifier. In these cases and
4158 whenever a class-specifier or enum-specifier is present in the
4159 decl-specifier-seq, the identifiers in these specifiers are among
4160 the names being declared by the declaration (as class-name,
4161 enum-names, or enumerators, depending on the syntax). In such
4162 cases, and except for the declaration of an unnamed bit-field (9.6),
4163 the decl-specifier-seq shall introduce one or more names into the
4164 program, or shall redeclare a name introduced by a previous
4165 declaration. [Example:
4166 enum { }; // ill-formed
4167 typedef class { }; // ill-formed
4171 error ("missing type-name in typedef-declaration");
4174 /* Anonymous unions are objects, so they can have specifiers. */;
4175 SET_ANON_AGGR_TYPE_P (declared_type);
4177 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4178 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4183 if (declspecs->specs[(int)ds_inline]
4184 || declspecs->specs[(int)ds_virtual])
4185 error ("%qs can only be specified for functions",
4186 declspecs->specs[(int)ds_inline]
4187 ? "inline" : "virtual");
4189 && (!current_class_type
4190 || current_scope () != current_class_type))
4191 error ("%<friend%> can only be specified inside a class");
4192 else if (declspecs->specs[(int)ds_explicit])
4193 error ("%<explicit%> can only be specified for constructors");
4194 else if (declspecs->storage_class)
4195 error ("a storage class can only be specified for objects "
4197 else if (declspecs->specs[(int)ds_const]
4198 || declspecs->specs[(int)ds_volatile]
4199 || declspecs->specs[(int)ds_restrict]
4200 || declspecs->specs[(int)ds_thread])
4201 error ("qualifiers can only be specified for objects "
4203 else if (saw_typedef)
4204 warning (0, "%<typedef%> was ignored in this declaration");
4205 else if (declspecs->specs[(int) ds_constexpr])
4206 error ("%<constexpr%> cannot be used for type declarations");
4209 return declared_type;
4212 /* Called when a declaration is seen that contains no names to declare.
4213 If its type is a reference to a structure, union or enum inherited
4214 from a containing scope, shadow that tag name for the current scope
4215 with a forward reference.
4216 If its type defines a new named structure or union
4217 or defines an enum, it is valid but we need not do anything here.
4218 Otherwise, it is an error.
4220 C++: may have to grok the declspecs to learn about static,
4221 complain for anonymous unions.
4223 Returns the TYPE declared -- or NULL_TREE if none. */
4226 shadow_tag (cp_decl_specifier_seq *declspecs)
4228 tree t = check_tag_decl (declspecs);
4233 if (declspecs->attributes)
4235 warning (0, "attribute ignored in declaration of %q+#T", t);
4236 warning (0, "attribute for %q+#T must follow the %qs keyword",
4237 t, class_key_or_enum_as_string (t));
4241 if (maybe_process_partial_specialization (t) == error_mark_node)
4244 /* This is where the variables in an anonymous union are
4245 declared. An anonymous union declaration looks like:
4247 because there is no declarator after the union, the parser
4248 sends that declaration here. */
4249 if (ANON_AGGR_TYPE_P (t))
4251 fixup_anonymous_aggr (t);
4253 if (TYPE_FIELDS (t))
4255 tree decl = grokdeclarator (/*declarator=*/NULL,
4256 declspecs, NORMAL, 0, NULL);
4257 finish_anon_union (decl);
4264 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4267 groktypename (cp_decl_specifier_seq *type_specifiers,
4268 const cp_declarator *declarator,
4269 bool is_template_arg)
4273 enum decl_context context
4274 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4275 attrs = type_specifiers->attributes;
4276 type_specifiers->attributes = NULL_TREE;
4277 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4278 if (attrs && type != error_mark_node)
4280 if (CLASS_TYPE_P (type))
4281 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4282 "outside of definition", type);
4283 else if (MAYBE_CLASS_TYPE_P (type))
4284 /* A template type parameter or other dependent type. */
4285 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4286 "type %qT without an associated declaration", type);
4288 cplus_decl_attributes (&type, attrs, 0);
4293 /* Process a DECLARATOR for a function-scope variable declaration,
4294 namespace-scope variable declaration, or function declaration.
4295 (Function definitions go through start_function; class member
4296 declarations appearing in the body of the class go through
4297 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4298 If an error occurs, the error_mark_node is returned instead.
4300 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4301 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4302 for an explicitly defaulted function, or SD_DELETED for an explicitly
4303 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4304 implicitly initialized via a default constructor. ATTRIBUTES and
4305 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4307 The scope represented by the context of the returned DECL is pushed
4308 (if it is not the global namespace) and is assigned to
4309 *PUSHED_SCOPE_P. The caller is then responsible for calling
4310 pop_scope on *PUSHED_SCOPE_P if it is set. */
4313 start_decl (const cp_declarator *declarator,
4314 cp_decl_specifier_seq *declspecs,
4317 tree prefix_attributes,
4318 tree *pushed_scope_p)
4326 *pushed_scope_p = NULL_TREE;
4328 /* An object declared as __attribute__((deprecated)) suppresses
4329 warnings of uses of other deprecated items. */
4330 if (lookup_attribute ("deprecated", attributes))
4331 deprecated_state = DEPRECATED_SUPPRESS;
4333 attributes = chainon (attributes, prefix_attributes);
4335 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4338 deprecated_state = DEPRECATED_NORMAL;
4340 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4341 || decl == error_mark_node)
4342 return error_mark_node;
4344 context = CP_DECL_CONTEXT (decl);
4345 if (context != global_namespace)
4346 *pushed_scope_p = push_scope (context);
4349 /* Is it valid for this decl to have an initializer at all?
4350 If not, set INITIALIZED to zero, which will indirectly
4351 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4352 switch (TREE_CODE (decl))
4355 error ("typedef %qD is initialized (use decltype instead)", decl);
4356 return error_mark_node;
4359 if (initialized == SD_DELETED)
4360 /* We'll handle the rest of the semantics later, but we need to
4361 set this now so it's visible to duplicate_decls. */
4362 DECL_DELETED_FN (decl) = 1;
4371 if (! toplevel_bindings_p ()
4372 && DECL_EXTERNAL (decl))
4373 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4375 DECL_EXTERNAL (decl) = 0;
4376 if (toplevel_bindings_p ())
4377 TREE_STATIC (decl) = 1;
4379 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4381 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4382 record_key_method_defined (decl);
4384 /* If this is a typedef that names the class for linkage purposes
4385 (7.1.3p8), apply any attributes directly to the type. */
4386 if (TREE_CODE (decl) == TYPE_DECL
4387 && TAGGED_TYPE_P (TREE_TYPE (decl))
4388 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4389 flags = ATTR_FLAG_TYPE_IN_PLACE;
4393 /* Set attributes here so if duplicate decl, will have proper attributes. */
4394 cplus_decl_attributes (&decl, attributes, flags);
4396 /* Dllimported symbols cannot be defined. Static data members (which
4397 can be initialized in-class and dllimported) go through grokfield,
4398 not here, so we don't need to exclude those decls when checking for
4400 if (initialized && DECL_DLLIMPORT_P (decl))
4402 error ("definition of %q#D is marked %<dllimport%>", decl);
4403 DECL_DLLIMPORT_P (decl) = 0;
4406 /* If #pragma weak was used, mark the decl weak now. */
4407 maybe_apply_pragma_weak (decl);
4409 if (TREE_CODE (decl) == FUNCTION_DECL
4410 && DECL_DECLARED_INLINE_P (decl)
4411 && DECL_UNINLINABLE (decl)
4412 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4413 warning (0, "inline function %q+D given attribute noinline", decl);
4415 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4417 if (TREE_CODE (decl) == VAR_DECL)
4419 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4420 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4421 error ("%q#D is not a static member of %q#T", decl, context);
4424 if (DECL_CONTEXT (field) != context)
4426 if (!same_type_p (DECL_CONTEXT (field), context))
4427 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4428 "to be defined as %<%T::%D%>",
4429 DECL_CONTEXT (field), DECL_NAME (decl),
4430 context, DECL_NAME (decl));
4431 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4433 if (processing_specialization
4434 && template_class_depth (context) == 0
4435 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4436 error ("template header not allowed in member definition "
4437 "of explicitly specialized class");
4438 /* Static data member are tricky; an in-class initialization
4439 still doesn't provide a definition, so the in-class
4440 declaration will have DECL_EXTERNAL set, but will have an
4441 initialization. Thus, duplicate_decls won't warn
4442 about this situation, and so we check here. */
4443 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4444 error ("duplicate initialization of %qD", decl);
4445 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4447 if (declspecs->specs[(int) ds_constexpr]
4448 && !DECL_DECLARED_CONSTEXPR_P (field))
4449 error ("%qD declared %<constexpr%> outside its class", field);
4454 tree field = check_classfn (context, decl,
4455 (processing_template_decl
4456 > template_class_depth (context))
4457 ? current_template_parms
4459 if (field && field != error_mark_node
4460 && duplicate_decls (decl, field,
4461 /*newdecl_is_friend=*/false))
4465 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4466 DECL_IN_AGGR_P (decl) = 0;
4467 /* Do not mark DECL as an explicit specialization if it was not
4468 already marked as an instantiation; a declaration should
4469 never be marked as a specialization unless we know what
4470 template is being specialized. */
4471 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4473 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4475 /* [temp.expl.spec] An explicit specialization of a static data
4476 member of a template is a definition if the declaration
4477 includes an initializer; otherwise, it is a declaration.
4479 We check for processing_specialization so this only applies
4480 to the new specialization syntax. */
4481 if (!initialized && processing_specialization)
4482 DECL_EXTERNAL (decl) = 1;
4485 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4486 /* Aliases are definitions. */
4488 permerror (input_location, "declaration of %q#D outside of class is not definition",
4492 was_public = TREE_PUBLIC (decl);
4494 /* Enter this declaration into the symbol table. */
4495 decl = maybe_push_decl (decl);
4497 if (processing_template_decl)
4498 decl = push_template_decl (decl);
4499 if (decl == error_mark_node)
4500 return error_mark_node;
4502 /* Tell the back end to use or not use .common as appropriate. If we say
4503 -fconserve-space, we want this to save .data space, at the expense of
4504 wrong semantics. If we say -fno-conserve-space, we want this to
4505 produce errors about redefs; to do this we force variables into the
4507 if (flag_conserve_space
4508 && TREE_CODE (decl) == VAR_DECL
4509 && TREE_PUBLIC (decl)
4510 && !DECL_THREAD_LOCAL_P (decl)
4511 && !have_global_bss_p ())
4512 DECL_COMMON (decl) = 1;
4514 if (TREE_CODE (decl) == VAR_DECL
4515 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4516 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4518 /* This is a const variable with implicit 'static'. Set
4519 DECL_THIS_STATIC so we can tell it from variables that are
4520 !TREE_PUBLIC because of the anonymous namespace. */
4521 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4522 DECL_THIS_STATIC (decl) = 1;
4525 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4526 start_decl_1 (decl, initialized);
4531 /* Process the declaration of a variable DECL. INITIALIZED is true
4532 iff DECL is explicitly initialized. (INITIALIZED is false if the
4533 variable is initialized via an implicitly-called constructor.)
4534 This function must be called for ordinary variables (including, for
4535 example, implicit instantiations of templates), but must not be
4536 called for template declarations. */
4539 start_decl_1 (tree decl, bool initialized)
4543 bool aggregate_definition_p;
4545 gcc_assert (!processing_template_decl);
4547 if (error_operand_p (decl))
4550 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4552 type = TREE_TYPE (decl);
4553 complete_p = COMPLETE_TYPE_P (type);
4554 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4556 /* If an explicit initializer is present, or if this is a definition
4557 of an aggregate, then we need a complete type at this point.
4558 (Scalars are always complete types, so there is nothing to
4559 check.) This code just sets COMPLETE_P; errors (if necessary)
4560 are issued below. */
4561 if ((initialized || aggregate_definition_p)
4563 && COMPLETE_TYPE_P (complete_type (type)))
4566 /* We will not yet have set TREE_READONLY on DECL if the type
4567 was "const", but incomplete, before this point. But, now, we
4568 have a complete type, so we can try again. */
4569 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4573 /* Is it valid for this decl to have an initializer at all? */
4575 /* Don't allow initializations for incomplete types except for
4576 arrays which might be completed by the initialization. */
4578 ; /* A complete type is ok. */
4579 else if (type_uses_auto (type))
4580 ; /* An auto type is ok. */
4581 else if (TREE_CODE (type) != ARRAY_TYPE)
4583 error ("variable %q#D has initializer but incomplete type", decl);
4584 type = TREE_TYPE (decl) = error_mark_node;
4586 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4588 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4589 error ("elements of array %q#D have incomplete type", decl);
4590 /* else we already gave an error in start_decl. */
4593 else if (aggregate_definition_p && !complete_p)
4595 if (type_uses_auto (type))
4596 error ("declaration of %q#D has no initializer", decl);
4598 error ("aggregate %q#D has incomplete type and cannot be defined",
4600 /* Change the type so that assemble_variable will give
4601 DECL an rtl we can live with: (mem (const_int 0)). */
4602 type = TREE_TYPE (decl) = error_mark_node;
4605 /* Create a new scope to hold this declaration if necessary.
4606 Whether or not a new scope is necessary cannot be determined
4607 until after the type has been completed; if the type is a
4608 specialization of a class template it is not until after
4609 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4610 will be set correctly. */
4611 maybe_push_cleanup_level (type);
4614 /* Handle initialization of references. DECL, TYPE, and INIT have the
4615 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4616 but will be set to a new CLEANUP_STMT if a temporary is created
4617 that must be destroyed subsequently.
4619 Returns an initializer expression to use to initialize DECL, or
4620 NULL if the initialization can be performed statically.
4622 Quotes on semantics can be found in ARM 8.4.3. */
4625 grok_reference_init (tree decl, tree type, tree init, int flags)
4627 if (init == NULL_TREE)
4629 if ((DECL_LANG_SPECIFIC (decl) == 0
4630 || DECL_IN_AGGR_P (decl) == 0)
4631 && ! DECL_THIS_EXTERN (decl))
4632 error ("%qD declared as reference but not initialized", decl);
4636 if (TREE_CODE (init) == TREE_LIST)
4637 init = build_x_compound_expr_from_list (init, ELK_INIT,
4638 tf_warning_or_error);
4640 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4641 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4642 /* Note: default conversion is only called in very special cases. */
4643 init = decay_conversion (init);
4645 /* Convert INIT to the reference type TYPE. This may involve the
4646 creation of a temporary, whose lifetime must be the same as that
4647 of the reference. If so, a DECL_EXPR for the temporary will be
4648 added just after the DECL_EXPR for DECL. That's why we don't set
4649 DECL_INITIAL for local references (instead assigning to them
4650 explicitly); we need to allow the temporary to be initialized
4652 return initialize_reference (type, init, flags,
4653 tf_warning_or_error);
4656 /* Designated initializers in arrays are not supported in GNU C++.
4657 The parser cannot detect this error since it does not know whether
4658 a given brace-enclosed initializer is for a class type or for an
4659 array. This function checks that CE does not use a designated
4660 initializer. If it does, an error is issued. Returns true if CE
4661 is valid, i.e., does not have a designated initializer. */
4664 check_array_designated_initializer (const constructor_elt *ce,
4665 unsigned HOST_WIDE_INT index)
4667 /* Designated initializers for array elements are not supported. */
4670 /* The parser only allows identifiers as designated
4672 if (ce->index == error_mark_node)
4673 error ("name used in a GNU-style designated "
4674 "initializer for an array");
4675 else if (TREE_CODE (ce->index) == INTEGER_CST)
4677 /* A C99 designator is OK if it matches the current index. */
4678 if (TREE_INT_CST_LOW (ce->index) == index)
4681 sorry ("non-trivial designated initializers not supported");
4685 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4686 error ("name %qD used in a GNU-style designated "
4687 "initializer for an array", ce->index);
4695 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4696 array until we finish parsing the initializer. If that's the
4697 situation we're in, update DECL accordingly. */
4700 maybe_deduce_size_from_array_init (tree decl, tree init)
4702 tree type = TREE_TYPE (decl);
4704 if (TREE_CODE (type) == ARRAY_TYPE
4705 && TYPE_DOMAIN (type) == NULL_TREE
4706 && TREE_CODE (decl) != TYPE_DECL)
4708 /* do_default is really a C-ism to deal with tentative definitions.
4709 But let's leave it here to ease the eventual merge. */
4710 int do_default = !DECL_EXTERNAL (decl);
4711 tree initializer = init ? init : DECL_INITIAL (decl);
4714 /* Check that there are no designated initializers in INIT, as
4715 those are not supported in GNU C++, and as the middle-end
4716 will crash if presented with a non-numeric designated
4718 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4720 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4721 constructor_elt *ce;
4723 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4724 if (!check_array_designated_initializer (ce, i))
4730 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4734 error ("initializer fails to determine size of %qD", decl);
4735 TREE_TYPE (decl) = error_mark_node;
4737 else if (failure == 2)
4741 error ("array size missing in %qD", decl);
4742 TREE_TYPE (decl) = error_mark_node;
4744 /* If a `static' var's size isn't known, make it extern as
4745 well as static, so it does not get allocated. If it's not
4746 `static', then don't mark it extern; finish_incomplete_decl
4747 will give it a default size and it will get allocated. */
4748 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4749 DECL_EXTERNAL (decl) = 1;
4751 else if (failure == 3)
4753 error ("zero-size array %qD", decl);
4754 TREE_TYPE (decl) = error_mark_node;
4758 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4760 relayout_decl (decl);
4764 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4765 any appropriate error messages regarding the layout. */
4768 layout_var_decl (tree decl)
4772 type = TREE_TYPE (decl);
4773 if (type == error_mark_node)
4776 /* If we haven't already layed out this declaration, do so now.
4777 Note that we must not call complete type for an external object
4778 because it's type might involve templates that we are not
4779 supposed to instantiate yet. (And it's perfectly valid to say
4780 `extern X x' for some incomplete type `X'.) */
4781 if (!DECL_EXTERNAL (decl))
4782 complete_type (type);
4783 if (!DECL_SIZE (decl)
4784 && TREE_TYPE (decl) != error_mark_node
4785 && (COMPLETE_TYPE_P (type)
4786 || (TREE_CODE (type) == ARRAY_TYPE
4787 && !TYPE_DOMAIN (type)
4788 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4789 layout_decl (decl, 0);
4791 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4793 /* An automatic variable with an incomplete type: that is an error.
4794 Don't talk about array types here, since we took care of that
4795 message in grokdeclarator. */
4796 error ("storage size of %qD isn%'t known", decl);
4797 TREE_TYPE (decl) = error_mark_node;
4800 /* Keep this code around in case we later want to control debug info
4801 based on whether a type is "used". (jason 1999-11-11) */
4803 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4804 /* Let debugger know it should output info for this type. */
4805 note_debug_info_needed (ttype);
4807 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4808 note_debug_info_needed (DECL_CONTEXT (decl));
4811 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4812 && DECL_SIZE (decl) != NULL_TREE
4813 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4815 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4816 constant_expression_warning (DECL_SIZE (decl));
4819 error ("storage size of %qD isn%'t constant", decl);
4820 TREE_TYPE (decl) = error_mark_node;
4825 /* If a local static variable is declared in an inline function, or if
4826 we have a weak definition, we must endeavor to create only one
4827 instance of the variable at link-time. */
4830 maybe_commonize_var (tree decl)
4832 /* Static data in a function with comdat linkage also has comdat
4834 if (TREE_STATIC (decl)
4835 /* Don't mess with __FUNCTION__. */
4836 && ! DECL_ARTIFICIAL (decl)
4837 && DECL_FUNCTION_SCOPE_P (decl)
4838 && vague_linkage_p (DECL_CONTEXT (decl)))
4842 /* With weak symbols, we simply make the variable COMDAT;
4843 that will cause copies in multiple translations units to
4845 comdat_linkage (decl);
4849 if (DECL_INITIAL (decl) == NULL_TREE
4850 || DECL_INITIAL (decl) == error_mark_node)
4852 /* Without weak symbols, we can use COMMON to merge
4853 uninitialized variables. */
4854 TREE_PUBLIC (decl) = 1;
4855 DECL_COMMON (decl) = 1;
4859 /* While for initialized variables, we must use internal
4860 linkage -- which means that multiple copies will not
4862 TREE_PUBLIC (decl) = 0;
4863 DECL_COMMON (decl) = 0;
4864 warning_at (input_location, 0,
4865 "sorry: semantics of inline function static "
4866 "data %q+#D are wrong (you%'ll wind up "
4867 "with multiple copies)", decl);
4868 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4869 " you can work around this by removing "
4874 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4875 /* Set it up again; we might have set DECL_INITIAL since the last
4877 comdat_linkage (decl);
4880 /* Issue an error message if DECL is an uninitialized const variable. */
4883 check_for_uninitialized_const_var (tree decl)
4885 tree type = strip_array_types (TREE_TYPE (decl));
4887 /* ``Unless explicitly declared extern, a const object does not have
4888 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4890 if (TREE_CODE (decl) == VAR_DECL
4891 && TREE_CODE (type) != REFERENCE_TYPE
4892 && CP_TYPE_CONST_P (type)
4893 && !DECL_INITIAL (decl))
4895 tree field = default_init_uninitialized_part (type);
4899 permerror (DECL_SOURCE_LOCATION (decl),
4900 "uninitialized const %qD", decl);
4902 if (CLASS_TYPE_P (type))
4904 tree defaulted_ctor;
4906 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4907 "%q#T has no user-provided default constructor", type);
4908 defaulted_ctor = in_class_defaulted_default_constructor (type);
4910 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4911 "constructor is not user-provided because it is "
4912 "explicitly defaulted in the class body");
4913 inform (0, "and the implicitly-defined constructor does not "
4914 "initialize %q+#D", field);
4919 /* Structure holding the current initializer being processed by reshape_init.
4920 CUR is a pointer to the current element being processed, END is a pointer
4921 after the last element present in the initializer. */
4922 typedef struct reshape_iterator_t
4924 constructor_elt *cur;
4925 constructor_elt *end;
4928 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4930 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4931 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4932 initialized. If there are no more such fields, the return value
4936 next_initializable_field (tree field)
4939 && (TREE_CODE (field) != FIELD_DECL
4940 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4941 || DECL_ARTIFICIAL (field)))
4942 field = DECL_CHAIN (field);
4947 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4948 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4949 INTEGER_CST representing the size of the array minus one (the maximum index),
4950 or NULL_TREE if the array was declared without specifying the size. D is
4951 the iterator within the constructor. */
4954 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4955 tsubst_flags_t complain)
4958 bool sized_array_p = (max_index != NULL_TREE);
4959 unsigned HOST_WIDE_INT max_index_cst = 0;
4960 unsigned HOST_WIDE_INT index;
4962 /* The initializer for an array is always a CONSTRUCTOR. */
4963 new_init = build_constructor (init_list_type_node, NULL);
4967 /* Minus 1 is used for zero sized arrays. */
4968 if (integer_all_onesp (max_index))
4971 if (host_integerp (max_index, 1))
4972 max_index_cst = tree_low_cst (max_index, 1);
4973 /* sizetype is sign extended, not zero extended. */
4975 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4979 /* Loop until there are no more initializers. */
4981 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4986 check_array_designated_initializer (d->cur, index);
4987 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4989 if (elt_init == error_mark_node)
4990 return error_mark_node;
4991 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4992 size_int (index), elt_init);
4993 if (!TREE_CONSTANT (elt_init))
4994 TREE_CONSTANT (new_init) = false;
5000 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5001 Parameters are the same of reshape_init_r. */
5004 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5006 tree max_index = NULL_TREE;
5008 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5010 if (TYPE_DOMAIN (type))
5011 max_index = array_type_nelts (type);
5013 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5016 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5017 Parameters are the same of reshape_init_r. */
5020 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5022 tree max_index = NULL_TREE;
5024 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5026 if (COMPOUND_LITERAL_P (d->cur->value))
5028 tree value = d->cur->value;
5029 if (!same_type_p (TREE_TYPE (value), type))
5031 if (complain & tf_error)
5032 error ("invalid type %qT as initializer for a vector of type %qT",
5033 TREE_TYPE (d->cur->value), type);
5034 value = error_mark_node;
5040 /* For a vector, we initialize it as an array of the appropriate size. */
5041 if (TREE_CODE (type) == VECTOR_TYPE)
5042 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5044 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5047 /* Subroutine of reshape_init_r, processes the initializers for classes
5048 or union. Parameters are the same of reshape_init_r. */
5051 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5052 tsubst_flags_t complain)
5057 gcc_assert (CLASS_TYPE_P (type));
5059 /* The initializer for a class is always a CONSTRUCTOR. */
5060 new_init = build_constructor (init_list_type_node, NULL);
5061 field = next_initializable_field (TYPE_FIELDS (type));
5067 An initializer for an aggregate member that is an
5068 empty class shall have the form of an empty
5069 initializer-list {}. */
5070 if (!first_initializer_p)
5072 if (complain & tf_error)
5073 error ("initializer for %qT must be brace-enclosed", type);
5074 return error_mark_node;
5079 /* Loop through the initializable fields, gathering initializers. */
5080 while (d->cur != d->end)
5084 /* Handle designated initializers, as an extension. */
5087 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5089 if (complain & tf_error)
5090 error ("%<[%E] =%> used in a GNU-style designated initializer"
5091 " for class %qT", d->cur->index, type);
5092 return error_mark_node;
5095 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5097 if (!field || TREE_CODE (field) != FIELD_DECL)
5099 if (complain & tf_error)
5100 error ("%qT has no non-static data member named %qD", type,
5102 return error_mark_node;
5106 /* If we processed all the member of the class, we are done. */
5110 field_init = reshape_init_r (TREE_TYPE (field), d,
5111 /*first_initializer_p=*/false, complain);
5112 if (field_init == error_mark_node)
5113 return error_mark_node;
5115 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5119 When a union is initialized with a brace-enclosed
5120 initializer, the braces shall only contain an
5121 initializer for the first member of the union. */
5122 if (TREE_CODE (type) == UNION_TYPE)
5125 field = next_initializable_field (DECL_CHAIN (field));
5131 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5132 designators are not valid; either complain or return true to indicate
5133 that reshape_init_r should return error_mark_node. */
5136 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5140 if (complain & tf_error)
5141 error ("C99 designator %qE outside aggregate initializer",
5149 /* Subroutine of reshape_init, which processes a single initializer (part of
5150 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5151 iterator within the CONSTRUCTOR which points to the initializer to process.
5152 FIRST_INITIALIZER_P is true if this is the first initializer of the
5153 outermost CONSTRUCTOR node. */
5156 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5157 tsubst_flags_t complain)
5159 tree init = d->cur->value;
5161 if (error_operand_p (init))
5162 return error_mark_node;
5164 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5165 && has_designator_problem (d, complain))
5166 return error_mark_node;
5168 if (TREE_CODE (type) == COMPLEX_TYPE)
5170 /* A complex type can be initialized from one or two initializers,
5171 but braces are not elided. */
5173 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5175 if (CONSTRUCTOR_NELTS (init) > 2)
5177 if (complain & tf_error)
5178 error ("too many initializers for %qT", type);
5180 return error_mark_node;
5183 else if (first_initializer_p && d->cur != d->end)
5185 VEC(constructor_elt, gc) *v = 0;
5186 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5187 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5188 if (has_designator_problem (d, complain))
5189 return error_mark_node;
5191 init = build_constructor (init_list_type_node, v);
5196 /* A non-aggregate type is always initialized with a single
5198 if (!CP_AGGREGATE_TYPE_P (type))
5200 /* It is invalid to initialize a non-aggregate type with a
5201 brace-enclosed initializer before C++0x.
5202 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5203 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5204 a CONSTRUCTOR (with a record type). */
5205 if (TREE_CODE (init) == CONSTRUCTOR
5206 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5208 if (SCALAR_TYPE_P (type))
5210 if (complain & tf_error)
5211 error ("braces around scalar initializer for type %qT", type);
5212 init = error_mark_node;
5215 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5224 All implicit type conversions (clause _conv_) are considered when
5225 initializing the aggregate member with an initializer from an
5226 initializer-list. If the initializer can initialize a member,
5227 the member is initialized. Otherwise, if the member is itself a
5228 non-empty subaggregate, brace elision is assumed and the
5229 initializer is considered for the initialization of the first
5230 member of the subaggregate. */
5231 if (TREE_CODE (init) != CONSTRUCTOR
5232 /* But don't try this for the first initializer, since that would be
5233 looking through the outermost braces; A a2 = { a1 }; is not a
5234 valid aggregate initialization. */
5235 && !first_initializer_p
5236 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5237 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5243 /* [dcl.init.string]
5245 A char array (whether plain char, signed char, or unsigned char)
5246 can be initialized by a string-literal (optionally enclosed in
5247 braces); a wchar_t array can be initialized by a wide
5248 string-literal (optionally enclosed in braces). */
5249 if (TREE_CODE (type) == ARRAY_TYPE
5250 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5252 tree str_init = init;
5254 /* Strip one level of braces if and only if they enclose a single
5255 element (as allowed by [dcl.init.string]). */
5256 if (!first_initializer_p
5257 && TREE_CODE (str_init) == CONSTRUCTOR
5258 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5260 str_init = VEC_index (constructor_elt,
5261 CONSTRUCTOR_ELTS (str_init), 0)->value;
5264 /* If it's a string literal, then it's the initializer for the array
5265 as a whole. Otherwise, continue with normal initialization for
5266 array types (one value per array element). */
5267 if (TREE_CODE (str_init) == STRING_CST)
5269 if (has_designator_problem (d, complain))
5270 return error_mark_node;
5276 /* The following cases are about aggregates. If we are not within a full
5277 initializer already, and there is not a CONSTRUCTOR, it means that there
5278 is a missing set of braces (that is, we are processing the case for
5279 which reshape_init exists). */
5280 if (!first_initializer_p)
5282 if (TREE_CODE (init) == CONSTRUCTOR)
5284 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5285 /* There is no need to reshape pointer-to-member function
5286 initializers, as they are always constructed correctly
5287 by the front end. */
5289 else if (COMPOUND_LITERAL_P (init))
5290 /* For a nested compound literal, there is no need to reshape since
5291 brace elision is not allowed. Even if we decided to allow it,
5292 we should add a call to reshape_init in finish_compound_literal,
5293 before calling digest_init, so changing this code would still
5294 not be necessary. */
5295 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5299 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5300 return reshape_init (type, init, complain);
5304 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5308 /* Dispatch to specialized routines. */
5309 if (CLASS_TYPE_P (type))
5310 return reshape_init_class (type, d, first_initializer_p, complain);
5311 else if (TREE_CODE (type) == ARRAY_TYPE)
5312 return reshape_init_array (type, d, complain);
5313 else if (TREE_CODE (type) == VECTOR_TYPE)
5314 return reshape_init_vector (type, d, complain);
5319 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5320 brace-enclosed aggregate initializer.
5322 INIT is the CONSTRUCTOR containing the list of initializers describing
5323 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5324 It may not presently match the shape of the TYPE; for example:
5326 struct S { int a; int b; };
5327 struct S a[] = { 1, 2, 3, 4 };
5329 Here INIT will hold a VEC of four elements, rather than a
5330 VEC of two elements, each itself a VEC of two elements. This
5331 routine transforms INIT from the former form into the latter. The
5332 revised CONSTRUCTOR node is returned. */
5335 reshape_init (tree type, tree init, tsubst_flags_t complain)
5337 VEC(constructor_elt, gc) *v;
5341 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5343 v = CONSTRUCTOR_ELTS (init);
5345 /* An empty constructor does not need reshaping, and it is always a valid
5347 if (VEC_empty (constructor_elt, v))
5350 /* Recurse on this CONSTRUCTOR. */
5351 d.cur = VEC_index (constructor_elt, v, 0);
5352 d.end = d.cur + VEC_length (constructor_elt, v);
5354 new_init = reshape_init_r (type, &d, true, complain);
5355 if (new_init == error_mark_node)
5356 return error_mark_node;
5358 /* Make sure all the element of the constructor were used. Otherwise,
5359 issue an error about exceeding initializers. */
5362 if (complain & tf_error)
5363 error ("too many initializers for %qT", type);
5365 return error_mark_node;
5371 /* Verify array initializer. Returns true if errors have been reported. */
5374 check_array_initializer (tree decl, tree type, tree init)
5376 tree element_type = TREE_TYPE (type);
5378 /* The array type itself need not be complete, because the
5379 initializer may tell us how many elements are in the array.
5380 But, the elements of the array must be complete. */
5381 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5384 error ("elements of array %q#D have incomplete type", decl);
5386 error ("elements of array %q#T have incomplete type", type);
5389 /* It is not valid to initialize a VLA. */
5391 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5392 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5395 error ("variable-sized object %qD may not be initialized", decl);
5397 error ("variable-sized compound literal");
5403 /* Subroutine of check_initializer; args are passed down from that function.
5404 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5407 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5410 gcc_assert (stmts_are_full_exprs_p ());
5411 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5414 /* Verify INIT (the initializer for DECL), and record the
5415 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5416 grok_reference_init.
5418 If the return value is non-NULL, it is an expression that must be
5419 evaluated dynamically to initialize DECL. */
5422 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5424 tree type = TREE_TYPE (decl);
5425 tree init_code = NULL;
5426 tree extra_init = NULL_TREE;
5429 /* Things that are going to be initialized need to have complete
5431 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5433 if (DECL_HAS_VALUE_EXPR_P (decl))
5435 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5436 it doesn't have storage to be initialized. */
5437 gcc_assert (init == NULL_TREE);
5441 if (type == error_mark_node)
5442 /* We will have already complained. */
5445 if (TREE_CODE (type) == ARRAY_TYPE)
5447 if (check_array_initializer (decl, type, init))
5450 else if (!COMPLETE_TYPE_P (type))
5452 error ("%qD has incomplete type", decl);
5453 TREE_TYPE (decl) = error_mark_node;
5457 /* There is no way to make a variable-sized class type in GNU C++. */
5458 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5460 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5462 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5463 if (SCALAR_TYPE_P (type))
5467 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5468 init = build_zero_init (type, NULL_TREE, false);
5470 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5472 error ("scalar object %qD requires one element in initializer",
5474 TREE_TYPE (decl) = error_mark_node;
5480 if (TREE_CODE (decl) == CONST_DECL)
5482 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5484 DECL_INITIAL (decl) = init;
5486 gcc_assert (init != NULL_TREE);
5489 else if (!init && DECL_REALLY_EXTERN (decl))
5491 else if (init || type_build_ctor_call (type)
5492 || TREE_CODE (type) == REFERENCE_TYPE)
5494 if (TREE_CODE (type) == REFERENCE_TYPE)
5496 init = grok_reference_init (decl, type, init, flags);
5497 flags |= LOOKUP_ALREADY_DIGESTED;
5500 check_for_uninitialized_const_var (decl);
5501 /* Do not reshape constructors of vectors (they don't need to be
5503 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5505 if (is_std_init_list (type))
5507 init = perform_implicit_conversion (type, init,
5508 tf_warning_or_error);
5509 flags |= LOOKUP_ALREADY_DIGESTED;
5511 else if (TYPE_NON_AGGREGATE_CLASS (type))
5513 /* Don't reshape if the class has constructors. */
5514 if (cxx_dialect == cxx98)
5515 error ("in C++98 %qD must be initialized by constructor, "
5519 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5521 error ("opaque vector types cannot be initialized");
5522 init = error_mark_node;
5526 init = reshape_init (type, init, tf_warning_or_error);
5527 if (SCALAR_TYPE_P (type))
5528 check_narrowing (type, init);
5532 /* If DECL has an array type without a specific bound, deduce the
5533 array size from the initializer. */
5534 maybe_deduce_size_from_array_init (decl, init);
5535 type = TREE_TYPE (decl);
5536 if (type == error_mark_node)
5539 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5540 && !(flags & LOOKUP_ALREADY_DIGESTED)
5541 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5542 && CP_AGGREGATE_TYPE_P (type)))
5544 init_code = build_aggr_init_full_exprs (decl, init, flags);
5546 /* If this is a constexpr initializer, expand_default_init will
5547 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5548 case, pull the initializer back out and pass it down into
5549 store_init_value. */
5550 while (TREE_CODE (init_code) == EXPR_STMT
5551 || TREE_CODE (init_code) == CONVERT_EXPR)
5552 init_code = TREE_OPERAND (init_code, 0);
5553 if (TREE_CODE (init_code) == INIT_EXPR)
5555 init = TREE_OPERAND (init_code, 1);
5556 init_code = NULL_TREE;
5557 /* Don't call digest_init; it's unnecessary and will complain
5558 about aggregate initialization of non-aggregate classes. */
5559 flags |= LOOKUP_ALREADY_DIGESTED;
5561 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5563 /* Declared constexpr, but no suitable initializer; massage
5564 init appropriately so we can pass it into store_init_value
5566 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5567 init = finish_compound_literal (type, init,
5568 tf_warning_or_error);
5569 else if (CLASS_TYPE_P (type)
5570 && (!init || TREE_CODE (init) == TREE_LIST))
5572 init = build_functional_cast (type, init, tf_none);
5573 if (init != error_mark_node)
5574 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5576 init_code = NULL_TREE;
5582 if (init && TREE_CODE (init) != TREE_VEC)
5584 /* In aggregate initialization of a variable, each element
5585 initialization is a full-expression because there is no
5586 enclosing expression. */
5587 gcc_assert (stmts_are_full_exprs_p ());
5589 init_code = store_init_value (decl, init, cleanups, flags);
5591 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5592 && DECL_INITIAL (decl)
5593 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5594 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5595 warning (0, "array %qD initialized by parenthesized string literal %qE",
5596 decl, DECL_INITIAL (decl));
5602 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5603 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5604 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5605 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5608 check_for_uninitialized_const_var (decl);
5611 if (init && init != error_mark_node)
5612 init_code = build2 (INIT_EXPR, type, decl, init);
5615 init_code = add_stmt_to_compound (extra_init, init_code);
5617 if (init_code && DECL_IN_AGGR_P (decl))
5619 static int explained = 0;
5621 if (cxx_dialect < cxx0x)
5622 error ("initializer invalid for static member with constructor");
5624 error ("non-constant in-class initialization invalid for static "
5625 "member %qD", decl);
5628 error ("(an out of class initialization is required)");
5636 /* If DECL is not a local variable, give it RTL. */
5639 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5641 int toplev = toplevel_bindings_p ();
5643 const char *filename;
5645 /* Set the DECL_ASSEMBLER_NAME for the object. */
5648 /* The `register' keyword, when used together with an
5649 asm-specification, indicates that the variable should be
5650 placed in a particular register. */
5651 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5653 set_user_assembler_name (decl, asmspec);
5654 DECL_HARD_REGISTER (decl) = 1;
5658 if (TREE_CODE (decl) == FUNCTION_DECL
5659 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5660 set_builtin_user_assembler_name (decl, asmspec);
5661 set_user_assembler_name (decl, asmspec);
5665 /* Handle non-variables up front. */
5666 if (TREE_CODE (decl) != VAR_DECL)
5668 rest_of_decl_compilation (decl, toplev, at_eof);
5672 /* If we see a class member here, it should be a static data
5674 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5676 gcc_assert (TREE_STATIC (decl));
5677 /* An in-class declaration of a static data member should be
5678 external; it is only a declaration, and not a definition. */
5679 if (init == NULL_TREE)
5680 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5683 /* We don't create any RTL for local variables. */
5684 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5687 /* We defer emission of local statics until the corresponding
5688 DECL_EXPR is expanded. */
5689 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5691 /* We try to defer namespace-scope static constants so that they are
5692 not emitted into the object file unnecessarily. */
5693 filename = input_filename;
5694 if (!DECL_VIRTUAL_P (decl)
5695 && TREE_READONLY (decl)
5696 && DECL_INITIAL (decl) != NULL_TREE
5697 && DECL_INITIAL (decl) != error_mark_node
5699 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5701 && !TREE_PUBLIC (decl))
5703 /* Fool with the linkage of static consts according to #pragma
5705 struct c_fileinfo *finfo = get_fileinfo (filename);
5706 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5708 TREE_PUBLIC (decl) = 1;
5709 DECL_EXTERNAL (decl) = finfo->interface_only;
5714 /* Likewise for template instantiations. */
5715 else if (DECL_LANG_SPECIFIC (decl)
5716 && DECL_IMPLICIT_INSTANTIATION (decl))
5719 /* If we're not deferring, go ahead and assemble the variable. */
5721 rest_of_decl_compilation (decl, toplev, at_eof);
5724 /* walk_tree helper for wrap_temporary_cleanups, below. */
5727 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5729 /* Stop at types or full-expression boundaries. */
5730 if (TYPE_P (*stmt_p)
5731 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5737 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5739 tree guard = (tree)data;
5740 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5742 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5743 /* Tell honor_protect_cleanup_actions to handle this as a separate
5745 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5747 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5753 /* We're initializing a local variable which has a cleanup GUARD. If there
5754 are any temporaries used in the initializer INIT of this variable, we
5755 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5756 variable will be cleaned up properly if one of them throws.
5758 Unfortunately, there's no way to express this properly in terms of
5759 nesting, as the regions for the temporaries overlap the region for the
5760 variable itself; if there are two temporaries, the variable needs to be
5761 the first thing destroyed if either of them throws. However, we only
5762 want to run the variable's cleanup if it actually got constructed. So
5763 we need to guard the temporary cleanups with the variable's cleanup if
5764 they are run on the normal path, but not if they are run on the
5765 exceptional path. We implement this by telling
5766 honor_protect_cleanup_actions to strip the variable cleanup from the
5767 exceptional path. */
5770 wrap_temporary_cleanups (tree init, tree guard)
5772 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5775 /* Generate code to initialize DECL (a local variable). */
5778 initialize_local_var (tree decl, tree init)
5780 tree type = TREE_TYPE (decl);
5784 gcc_assert (TREE_CODE (decl) == VAR_DECL
5785 || TREE_CODE (decl) == RESULT_DECL);
5786 gcc_assert (!TREE_STATIC (decl));
5788 if (DECL_SIZE (decl) == NULL_TREE)
5790 /* If we used it already as memory, it must stay in memory. */
5791 DECL_INITIAL (decl) = NULL_TREE;
5792 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5796 if (type == error_mark_node)
5799 /* Compute and store the initial value. */
5800 already_used = TREE_USED (decl) || TREE_USED (type);
5801 if (TREE_USED (type))
5802 DECL_READ_P (decl) = 1;
5804 /* Generate a cleanup, if necessary. */
5805 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5807 /* Perform the initialization. */
5810 if (TREE_CODE (init) == INIT_EXPR
5811 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5813 /* Stick simple initializers in DECL_INITIAL so that
5814 -Wno-init-self works (c++/34772). */
5815 gcc_assert (TREE_OPERAND (init, 0) == decl);
5816 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5820 int saved_stmts_are_full_exprs_p;
5822 /* If we're only initializing a single object, guard the
5823 destructors of any temporaries used in its initializer with
5824 its destructor. This isn't right for arrays because each
5825 element initialization is a full-expression. */
5826 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5827 wrap_temporary_cleanups (init, cleanup);
5829 gcc_assert (building_stmt_list_p ());
5830 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5831 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5832 finish_expr_stmt (init);
5833 current_stmt_tree ()->stmts_are_full_exprs_p =
5834 saved_stmts_are_full_exprs_p;
5838 /* Set this to 0 so we can tell whether an aggregate which was
5839 initialized was ever used. Don't do this if it has a
5840 destructor, so we don't complain about the 'resource
5841 allocation is initialization' idiom. Now set
5842 attribute((unused)) on types so decls of that type will be
5843 marked used. (see TREE_USED, above.) */
5844 if (TYPE_NEEDS_CONSTRUCTING (type)
5846 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5847 && DECL_NAME (decl))
5848 TREE_USED (decl) = 0;
5849 else if (already_used)
5850 TREE_USED (decl) = 1;
5853 finish_decl_cleanup (decl, cleanup);
5856 /* DECL is a VAR_DECL for a compiler-generated variable with static
5857 storage duration (like a virtual table) whose initializer is a
5858 compile-time constant. Initialize the variable and provide it to the
5862 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5865 gcc_assert (DECL_ARTIFICIAL (decl));
5866 init = build_constructor (TREE_TYPE (decl), v);
5867 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5868 DECL_INITIAL (decl) = init;
5869 DECL_INITIALIZED_P (decl) = 1;
5870 determine_visibility (decl);
5871 layout_var_decl (decl);
5872 maybe_commonize_var (decl);
5873 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5876 /* INIT is the initializer for a variable, as represented by the
5877 parser. Returns true iff INIT is type-dependent. */
5880 type_dependent_init_p (tree init)
5882 if (TREE_CODE (init) == TREE_LIST)
5883 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5884 return any_type_dependent_elements_p (init);
5885 else if (TREE_CODE (init) == CONSTRUCTOR)
5886 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5888 VEC(constructor_elt, gc) *elts;
5892 elts = CONSTRUCTOR_ELTS (init);
5893 nelts = VEC_length (constructor_elt, elts);
5894 for (i = 0; i < nelts; ++i)
5895 if (type_dependent_init_p (VEC_index (constructor_elt,
5900 /* It must be a simple expression, e.g., int i = 3; */
5901 return type_dependent_expression_p (init);
5906 /* INIT is the initializer for a variable, as represented by the
5907 parser. Returns true iff INIT is value-dependent. */
5910 value_dependent_init_p (tree init)
5912 if (TREE_CODE (init) == TREE_LIST)
5913 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5914 return any_value_dependent_elements_p (init);
5915 else if (TREE_CODE (init) == CONSTRUCTOR)
5916 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5918 VEC(constructor_elt, gc) *elts;
5922 elts = CONSTRUCTOR_ELTS (init);
5923 nelts = VEC_length (constructor_elt, elts);
5924 for (i = 0; i < nelts; ++i)
5925 if (value_dependent_init_p (VEC_index (constructor_elt,
5930 /* It must be a simple expression, e.g., int i = 3; */
5931 return value_dependent_expression_p (init);
5936 /* Finish processing of a declaration;
5937 install its line number and initial value.
5938 If the length of an array type is not known before,
5939 it must be determined now, from the initial value, or it is an error.
5941 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5942 true, then INIT is an integral constant expression.
5944 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5945 if the (init) syntax was used. */
5948 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5949 tree asmspec_tree, int flags)
5952 VEC(tree,gc) *cleanups = NULL;
5953 const char *asmspec = NULL;
5954 int was_readonly = 0;
5955 bool var_definition_p = false;
5958 if (decl == error_mark_node)
5963 error ("assignment (not initialization) in declaration");
5967 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5968 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5969 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5971 type = TREE_TYPE (decl);
5972 if (type == error_mark_node)
5975 /* If a name was specified, get the string. */
5976 if (at_namespace_scope_p ())
5977 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5978 if (asmspec_tree && asmspec_tree != error_mark_node)
5979 asmspec = TREE_STRING_POINTER (asmspec_tree);
5981 if (current_class_type
5982 && CP_DECL_CONTEXT (decl) == current_class_type
5983 && TYPE_BEING_DEFINED (current_class_type)
5984 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5985 && (DECL_INITIAL (decl) || init))
5986 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5988 auto_node = type_uses_auto (type);
5992 if (init == NULL_TREE)
5994 error ("declaration of %q#D has no initializer", decl);
5995 TREE_TYPE (decl) = error_mark_node;
5999 if (TREE_CODE (d_init) == TREE_LIST)
6000 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6001 tf_warning_or_error);
6002 d_init = resolve_nondeduced_context (d_init);
6003 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6005 if (type == error_mark_node)
6009 if (!ensure_literal_type_for_constexpr_object (decl))
6010 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6012 if (TREE_CODE (decl) == VAR_DECL
6013 && DECL_CLASS_SCOPE_P (decl)
6014 && DECL_INITIALIZED_IN_CLASS_P (decl))
6015 check_static_variable_definition (decl, type);
6017 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6020 if (init == ridpointers[(int)RID_DELETE])
6022 /* FIXME check this is 1st decl. */
6023 DECL_DELETED_FN (decl) = 1;
6024 DECL_DECLARED_INLINE_P (decl) = 1;
6025 DECL_INITIAL (decl) = error_mark_node;
6026 FOR_EACH_CLONE (clone, decl)
6028 DECL_DELETED_FN (clone) = 1;
6029 DECL_DECLARED_INLINE_P (clone) = 1;
6030 DECL_INITIAL (clone) = error_mark_node;
6034 else if (init == ridpointers[(int)RID_DEFAULT])
6036 if (defaultable_fn_check (decl))
6037 DECL_DEFAULTED_FN (decl) = 1;
6039 DECL_INITIAL (decl) = NULL_TREE;
6043 if (init && TREE_CODE (decl) == VAR_DECL)
6045 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6046 /* If DECL is a reference, then we want to know whether init is a
6047 reference constant; init_const_expr_p as passed tells us whether
6048 it's an rvalue constant. */
6049 if (TREE_CODE (type) == REFERENCE_TYPE)
6050 init_const_expr_p = potential_constant_expression (init);
6051 if (init_const_expr_p)
6053 /* Set these flags now for templates. We'll update the flags in
6054 store_init_value for instantiations. */
6055 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6056 if (decl_maybe_constant_var_p (decl))
6057 TREE_CONSTANT (decl) = 1;
6061 if (processing_template_decl)
6063 bool type_dependent_p;
6065 /* Add this declaration to the statement-tree. */
6066 if (at_function_scope_p ())
6067 add_decl_expr (decl);
6069 type_dependent_p = dependent_type_p (type);
6071 if (check_for_bare_parameter_packs (init))
6074 DECL_INITIAL (decl) = NULL_TREE;
6077 /* Generally, initializers in templates are expanded when the
6078 template is instantiated. But, if DECL is a variable constant
6079 then it can be used in future constant expressions, so its value
6080 must be available. */
6082 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6083 /* We can't do anything if the decl has dependent type. */;
6085 && init_const_expr_p
6086 && !type_dependent_p
6087 && decl_maybe_constant_var_p (decl)
6088 && !type_dependent_init_p (init)
6089 && !value_dependent_init_p (init))
6091 /* This variable seems to be a non-dependent constant, so process
6092 its initializer. If check_initializer returns non-null the
6093 initialization wasn't constant after all. */
6095 cleanups = make_tree_vector ();
6096 init_code = check_initializer (decl, init, flags, &cleanups);
6097 if (init_code == NULL_TREE)
6099 release_tree_vector (cleanups);
6101 else if (!DECL_PRETTY_FUNCTION_P (decl))
6102 /* Deduce array size even if the initializer is dependent. */
6103 maybe_deduce_size_from_array_init (decl, init);
6106 DECL_INITIAL (decl) = init;
6110 /* Just store non-static data member initializers for later. */
6111 if (init && TREE_CODE (decl) == FIELD_DECL)
6112 DECL_INITIAL (decl) = init;
6114 /* Take care of TYPE_DECLs up front. */
6115 if (TREE_CODE (decl) == TYPE_DECL)
6117 if (type != error_mark_node
6118 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6120 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6121 warning (0, "shadowing previous type declaration of %q#D", decl);
6122 set_identifier_type_value (DECL_NAME (decl), decl);
6125 /* If we have installed this as the canonical typedef for this
6126 type, and that type has not been defined yet, delay emitting
6127 the debug information for it, as we will emit it later. */
6128 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6129 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6130 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6132 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6137 /* A reference will be modified here, as it is initialized. */
6138 if (! DECL_EXTERNAL (decl)
6139 && TREE_READONLY (decl)
6140 && TREE_CODE (type) == REFERENCE_TYPE)
6143 TREE_READONLY (decl) = 0;
6146 if (TREE_CODE (decl) == VAR_DECL)
6148 /* Only variables with trivial initialization and destruction can
6149 have thread-local storage. */
6150 if (DECL_THREAD_LOCAL_P (decl)
6151 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6152 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6153 error ("%qD cannot be thread-local because it has non-trivial "
6154 "type %qT", decl, TREE_TYPE (decl));
6155 /* If this is a local variable that will need a mangled name,
6156 register it now. We must do this before processing the
6157 initializer for the variable, since the initialization might
6158 require a guard variable, and since the mangled name of the
6159 guard variable will depend on the mangled name of this
6161 if (DECL_FUNCTION_SCOPE_P (decl)
6162 && TREE_STATIC (decl)
6163 && !DECL_ARTIFICIAL (decl))
6165 push_local_name (decl);
6166 if (DECL_CONSTRUCTOR_P (current_function_decl)
6167 || DECL_DESTRUCTOR_P (current_function_decl))
6168 /* Normally local_decls is populated during GIMPLE lowering,
6169 but [cd]tors are never actually compiled directly. We need
6170 to put statics on the list so we can deal with the label
6171 address extension. */
6172 add_local_decl (cfun, decl);
6175 /* Convert the initializer to the type of DECL, if we have not
6176 already initialized DECL. */
6177 if (!DECL_INITIALIZED_P (decl)
6178 /* If !DECL_EXTERNAL then DECL is being defined. In the
6179 case of a static data member initialized inside the
6180 class-specifier, there can be an initializer even if DECL
6181 is *not* defined. */
6182 && (!DECL_EXTERNAL (decl) || init))
6184 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6187 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6188 /* Allow libjava/prims.cc define primitive classes. */
6189 if (init != NULL_TREE
6190 || jclass == NULL_TREE
6191 || TREE_CODE (jclass) != TYPE_DECL
6192 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6193 || !same_type_ignoring_top_level_qualifiers_p
6194 (type, TREE_TYPE (TREE_TYPE (jclass))))
6195 error ("Java object %qD not allocated with %<new%>", decl);
6198 cleanups = make_tree_vector ();
6199 init = check_initializer (decl, init, flags, &cleanups);
6200 /* Thread-local storage cannot be dynamically initialized. */
6201 if (DECL_THREAD_LOCAL_P (decl) && init)
6203 error ("%qD is thread-local and so cannot be dynamically "
6204 "initialized", decl);
6208 /* Check that the initializer for a static data member was a
6209 constant. Although we check in the parser that the
6210 initializer is an integral constant expression, we do not
6211 simplify division-by-zero at the point at which it
6212 occurs. Therefore, in:
6214 struct S { static const int i = 7 / 0; };
6216 we issue an error at this point. It would
6217 probably be better to forbid division by zero in
6218 integral constant expressions. */
6219 if (DECL_EXTERNAL (decl) && init)
6221 error ("%qD cannot be initialized by a non-constant expression"
6222 " when being declared", decl);
6223 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6231 The memory occupied by any object of static storage
6232 duration is zero-initialized at program startup before
6233 any other initialization takes place.
6235 We cannot create an appropriate initializer until after
6236 the type of DECL is finalized. If DECL_INITIAL is set,
6237 then the DECL is statically initialized, and any
6238 necessary zero-initialization has already been performed. */
6239 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6240 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6241 /*nelts=*/NULL_TREE,
6242 /*static_storage_p=*/true);
6243 /* Remember that the initialization for this variable has
6245 DECL_INITIALIZED_P (decl) = 1;
6246 /* This declaration is the definition of this variable,
6247 unless we are initializing a static data member within
6248 the class specifier. */
6249 if (!DECL_EXTERNAL (decl))
6250 var_definition_p = true;
6252 /* If the variable has an array type, lay out the type, even if
6253 there is no initializer. It is valid to index through the
6254 array, and we must get TYPE_ALIGN set correctly on the array
6256 else if (TREE_CODE (type) == ARRAY_TYPE)
6259 if (TREE_STATIC (decl)
6260 && !at_function_scope_p ()
6261 && current_function_decl == NULL)
6262 /* So decl is a global variable or a static member of a
6263 non local class. Record the types it uses
6264 so that we can decide later to emit debug info for them. */
6265 record_types_used_by_current_var_decl (decl);
6267 else if (TREE_CODE (decl) == FIELD_DECL
6268 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6269 error ("non-static data member %qD has Java class type", decl);
6271 /* Add this declaration to the statement-tree. This needs to happen
6272 after the call to check_initializer so that the DECL_EXPR for a
6273 reference temp is added before the DECL_EXPR for the reference itself. */
6274 if (DECL_FUNCTION_SCOPE_P (decl))
6275 add_decl_expr (decl);
6277 /* Let the middle end know about variables and functions -- but not
6278 static data members in uninstantiated class templates. */
6279 if (TREE_CODE (decl) == VAR_DECL
6280 || TREE_CODE (decl) == FUNCTION_DECL)
6282 if (TREE_CODE (decl) == VAR_DECL)
6284 layout_var_decl (decl);
6285 maybe_commonize_var (decl);
6288 /* This needs to happen after the linkage is set. */
6289 determine_visibility (decl);
6291 if (var_definition_p && TREE_STATIC (decl))
6293 /* If a TREE_READONLY variable needs initialization
6294 at runtime, it is no longer readonly and we need to
6295 avoid MEM_READONLY_P being set on RTL created for it. */
6298 if (TREE_READONLY (decl))
6299 TREE_READONLY (decl) = 0;
6302 else if (was_readonly)
6303 TREE_READONLY (decl) = 1;
6306 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6308 /* Check for abstractness of the type. Notice that there is no
6309 need to strip array types here since the check for those types
6310 is already done within create_array_type_for_decl. */
6311 if (TREE_CODE (type) == FUNCTION_TYPE
6312 || TREE_CODE (type) == METHOD_TYPE)
6313 abstract_virtuals_error (decl, TREE_TYPE (type));
6315 abstract_virtuals_error (decl, type);
6317 if (TREE_TYPE (decl) == error_mark_node)
6318 /* No initialization required. */
6320 else if (TREE_CODE (decl) == FUNCTION_DECL)
6324 if (init == ridpointers[(int)RID_DEFAULT])
6326 /* An out-of-class default definition is defined at
6327 the point where it is explicitly defaulted. */
6328 if (DECL_DELETED_FN (decl))
6329 maybe_explain_implicit_delete (decl);
6330 else if (DECL_INITIAL (decl) == error_mark_node)
6331 synthesize_method (decl);
6334 error ("function %q#D is initialized like a variable", decl);
6336 /* else no initialization required. */
6338 else if (DECL_EXTERNAL (decl)
6339 && ! (DECL_LANG_SPECIFIC (decl)
6340 && DECL_NOT_REALLY_EXTERN (decl)))
6343 DECL_INITIAL (decl) = init;
6345 /* A variable definition. */
6346 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6347 /* Initialize the local variable. */
6348 initialize_local_var (decl, init);
6350 /* If a variable is defined, and then a subsequent
6351 definition with external linkage is encountered, we will
6352 get here twice for the same variable. We want to avoid
6353 calling expand_static_init more than once. For variables
6354 that are not static data members, we can call
6355 expand_static_init only when we actually process the
6356 initializer. It is not legal to redeclare a static data
6357 member, so this issue does not arise in that case. */
6358 else if (var_definition_p && TREE_STATIC (decl))
6359 expand_static_init (decl, init);
6362 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6363 reference, insert it in the statement-tree now. */
6367 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6368 push_cleanup (decl, t, false);
6369 release_tree_vector (cleanups);
6373 TREE_READONLY (decl) = 1;
6375 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6378 /* Returns a declaration for a VAR_DECL as if:
6380 extern "C" TYPE NAME;
6382 had been seen. Used to create compiler-generated global
6386 declare_global_var (tree name, tree type)
6390 push_to_top_level ();
6391 decl = build_decl (input_location, VAR_DECL, name, type);
6392 TREE_PUBLIC (decl) = 1;
6393 DECL_EXTERNAL (decl) = 1;
6394 DECL_ARTIFICIAL (decl) = 1;
6395 /* If the user has explicitly declared this variable (perhaps
6396 because the code we are compiling is part of a low-level runtime
6397 library), then it is possible that our declaration will be merged
6398 with theirs by pushdecl. */
6399 decl = pushdecl (decl);
6400 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6401 pop_from_top_level ();
6406 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6407 if "__cxa_atexit" is not being used) corresponding to the function
6408 to be called when the program exits. */
6411 get_atexit_fn_ptr_type (void)
6415 if (!atexit_fn_ptr_type_node)
6418 if (flag_use_cxa_atexit
6419 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6420 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6421 arg_type = ptr_type_node;
6423 /* The parameter to "atexit" is "void (*)(void)". */
6424 arg_type = NULL_TREE;
6426 fn_type = build_function_type_list (void_type_node,
6427 arg_type, NULL_TREE);
6428 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6431 return atexit_fn_ptr_type_node;
6434 /* Returns a pointer to the `atexit' function. Note that if
6435 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6436 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6439 get_atexit_node (void)
6445 bool use_aeabi_atexit;
6450 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6452 /* The declaration for `__cxa_atexit' is:
6454 int __cxa_atexit (void (*)(void *), void *, void *)
6456 We build up the argument types and then the function type
6458 tree argtype0, argtype1, argtype2;
6460 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6461 /* First, build the pointer-to-function type for the first
6463 fn_ptr_type = get_atexit_fn_ptr_type ();
6464 /* Then, build the rest of the argument types. */
6465 argtype2 = ptr_type_node;
6466 if (use_aeabi_atexit)
6468 argtype1 = fn_ptr_type;
6469 argtype0 = ptr_type_node;
6473 argtype1 = ptr_type_node;
6474 argtype0 = fn_ptr_type;
6476 /* And the final __cxa_atexit type. */
6477 fn_type = build_function_type_list (integer_type_node,
6478 argtype0, argtype1, argtype2,
6480 fn_ptr_type = build_pointer_type (fn_type);
6481 if (use_aeabi_atexit)
6482 name = "__aeabi_atexit";
6484 name = "__cxa_atexit";
6488 /* The declaration for `atexit' is:
6490 int atexit (void (*)());
6492 We build up the argument types and then the function type
6494 fn_ptr_type = get_atexit_fn_ptr_type ();
6495 /* Build the final atexit type. */
6496 fn_type = build_function_type_list (integer_type_node,
6497 fn_ptr_type, NULL_TREE);
6501 /* Now, build the function declaration. */
6502 push_lang_context (lang_name_c);
6503 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6504 mark_used (atexit_fndecl);
6505 pop_lang_context ();
6506 atexit_node = decay_conversion (atexit_fndecl);
6511 /* Returns the __dso_handle VAR_DECL. */
6514 get_dso_handle_node (void)
6516 if (dso_handle_node)
6517 return dso_handle_node;
6519 /* Declare the variable. */
6520 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6523 #ifdef HAVE_GAS_HIDDEN
6524 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6525 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6528 return dso_handle_node;
6531 /* Begin a new function with internal linkage whose job will be simply
6532 to destroy some particular variable. */
6534 static GTY(()) int start_cleanup_cnt;
6537 start_cleanup_fn (void)
6542 bool use_cxa_atexit = flag_use_cxa_atexit
6543 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6545 push_to_top_level ();
6547 /* No need to mangle this. */
6548 push_lang_context (lang_name_c);
6550 /* Build the name of the function. */
6551 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6552 /* Build the function declaration. */
6553 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6554 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6555 /* It's a function with internal linkage, generated by the
6557 TREE_PUBLIC (fndecl) = 0;
6558 DECL_ARTIFICIAL (fndecl) = 1;
6559 /* Make the function `inline' so that it is only emitted if it is
6560 actually needed. It is unlikely that it will be inlined, since
6561 it is only called via a function pointer, but we avoid unnecessary
6562 emissions this way. */
6563 DECL_DECLARED_INLINE_P (fndecl) = 1;
6564 DECL_INTERFACE_KNOWN (fndecl) = 1;
6565 /* Build the parameter. */
6570 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6571 DECL_CONTEXT (parmdecl) = fndecl;
6572 TREE_USED (parmdecl) = 1;
6573 DECL_READ_P (parmdecl) = 1;
6574 DECL_ARGUMENTS (fndecl) = parmdecl;
6578 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6580 pop_lang_context ();
6582 return current_function_decl;
6585 /* Finish the cleanup function begun by start_cleanup_fn. */
6588 end_cleanup_fn (void)
6590 expand_or_defer_fn (finish_function (0));
6592 pop_from_top_level ();
6595 /* Generate code to handle the destruction of DECL, an object with
6596 static storage duration. */
6599 register_dtor_fn (tree decl)
6606 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6608 type = TREE_TYPE (decl);
6609 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6610 return void_zero_node;
6612 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6613 a class object, we can just pass the destructor to
6614 "__cxa_atexit"; we don't have to build a temporary function to do
6616 use_dtor = (flag_use_cxa_atexit
6617 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6618 && CLASS_TYPE_P (type));
6623 /* Find the destructor. */
6624 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6625 gcc_assert (idx >= 0);
6626 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6627 /* Make sure it is accessible. */
6628 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6632 /* Call build_cleanup before we enter the anonymous function so
6633 that any access checks will be done relative to the current
6634 scope, rather than the scope of the anonymous function. */
6635 build_cleanup (decl);
6637 /* Now start the function. */
6638 cleanup = start_cleanup_fn ();
6640 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6641 to the original function, rather than the anonymous one. That
6642 will make the back end think that nested functions are in use,
6643 which causes confusion. */
6644 push_deferring_access_checks (dk_no_check);
6645 fcall = build_cleanup (decl);
6646 pop_deferring_access_checks ();
6648 /* Create the body of the anonymous function. */
6649 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6650 finish_expr_stmt (fcall);
6651 finish_compound_stmt (compound_stmt);
6655 /* Call atexit with the cleanup function. */
6656 mark_used (cleanup);
6657 cleanup = build_address (cleanup);
6658 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6664 /* We must convert CLEANUP to the type that "__cxa_atexit"
6666 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6667 /* "__cxa_atexit" will pass the address of DECL to the
6668 cleanup function. */
6670 addr = build_address (decl);
6671 /* The declared type of the parameter to "__cxa_atexit" is
6672 "void *". For plain "T*", we could just let the
6673 machinery in cp_build_function_call convert it -- but if the
6674 type is "cv-qualified T *", then we need to convert it
6675 before passing it in, to avoid spurious errors. */
6676 addr = build_nop (ptr_type_node, addr);
6679 /* Since the cleanup functions we build ignore the address
6680 they're given, there's no reason to pass the actual address
6681 in, and, in general, it's cheaper to pass NULL than any
6683 addr = null_pointer_node;
6684 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6685 tf_warning_or_error);
6686 if (targetm.cxx.use_aeabi_atexit ())
6699 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6700 arg0, arg1, arg2, NULL_TREE);
6703 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6704 is its initializer. Generate code to handle the construction
6705 and destruction of DECL. */
6708 expand_static_init (tree decl, tree init)
6710 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6711 gcc_assert (TREE_STATIC (decl));
6713 /* Some variables require no dynamic initialization. */
6715 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6718 if (DECL_FUNCTION_SCOPE_P (decl))
6720 /* Emit code to perform this initialization but once. */
6721 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6722 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6723 tree guard, guard_addr;
6726 /* Emit code to perform this initialization but once. This code
6729 static <type> guard;
6730 if (!guard.first_byte) {
6731 if (__cxa_guard_acquire (&guard)) {
6734 // Do initialization.
6735 flag = true; __cxa_guard_release (&guard);
6736 // Register variable for destruction at end of program.
6738 if (!flag) __cxa_guard_abort (&guard);
6742 Note that the `flag' variable is only set to 1 *after* the
6743 initialization is complete. This ensures that an exception,
6744 thrown during the construction, will cause the variable to
6745 reinitialized when we pass through this code again, as per:
6749 If the initialization exits by throwing an exception, the
6750 initialization is not complete, so it will be tried again
6751 the next time control enters the declaration.
6753 This process should be thread-safe, too; multiple threads
6754 should not be able to initialize the variable more than
6757 /* Create the guard variable. */
6758 guard = get_guard (decl);
6760 /* This optimization isn't safe on targets with relaxed memory
6761 consistency. On such targets we force synchronization in
6762 __cxa_guard_acquire. */
6763 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6765 /* Begin the conditional initialization. */
6766 if_stmt = begin_if_stmt ();
6767 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6768 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6771 if (flag_threadsafe_statics)
6773 tree vfntype = NULL_TREE;
6774 tree acquire_name, release_name, abort_name;
6775 tree acquire_fn, release_fn, abort_fn;
6776 guard_addr = build_address (guard);
6778 acquire_name = get_identifier ("__cxa_guard_acquire");
6779 release_name = get_identifier ("__cxa_guard_release");
6780 abort_name = get_identifier ("__cxa_guard_abort");
6781 acquire_fn = identifier_global_value (acquire_name);
6782 release_fn = identifier_global_value (release_name);
6783 abort_fn = identifier_global_value (abort_name);
6785 acquire_fn = push_library_fn
6786 (acquire_name, build_function_type_list (integer_type_node,
6787 TREE_TYPE (guard_addr),
6790 if (!release_fn || !abort_fn)
6791 vfntype = build_function_type_list (void_type_node,
6792 TREE_TYPE (guard_addr),
6795 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6797 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6799 inner_if_stmt = begin_if_stmt ();
6800 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6803 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6804 begin = get_target_expr (boolean_false_node);
6805 flag = TARGET_EXPR_SLOT (begin);
6807 TARGET_EXPR_CLEANUP (begin)
6808 = build3 (COND_EXPR, void_type_node, flag,
6810 build_call_n (abort_fn, 1, guard_addr));
6811 CLEANUP_EH_ONLY (begin) = 1;
6813 /* Do the initialization itself. */
6814 init = add_stmt_to_compound (begin, init);
6815 init = add_stmt_to_compound
6816 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6817 init = add_stmt_to_compound
6818 (init, build_call_n (release_fn, 1, guard_addr));
6821 init = add_stmt_to_compound (init, set_guard (guard));
6823 /* Use atexit to register a function for destroying this static
6825 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6827 finish_expr_stmt (init);
6829 if (flag_threadsafe_statics)
6831 finish_compound_stmt (inner_then_clause);
6832 finish_then_clause (inner_if_stmt);
6833 finish_if_stmt (inner_if_stmt);
6836 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6838 finish_compound_stmt (then_clause);
6839 finish_then_clause (if_stmt);
6840 finish_if_stmt (if_stmt);
6844 static_aggregates = tree_cons (init, decl, static_aggregates);
6848 /* Make TYPE a complete type based on INITIAL_VALUE.
6849 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6850 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6851 3 if the initializer list is empty (in pedantic mode). */
6854 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6857 tree type, elt_type;
6861 unsigned HOST_WIDE_INT i;
6864 /* An array of character type can be initialized from a
6865 brace-enclosed string constant.
6867 FIXME: this code is duplicated from reshape_init. Probably
6868 we should just call reshape_init here? */
6869 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6870 && TREE_CODE (initial_value) == CONSTRUCTOR
6871 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6873 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6874 tree value = VEC_index (constructor_elt, v, 0)->value;
6876 if (TREE_CODE (value) == STRING_CST
6877 && VEC_length (constructor_elt, v) == 1)
6878 initial_value = value;
6881 /* If any of the elements are parameter packs, we can't actually
6882 complete this type now because the array size is dependent. */
6883 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6885 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6888 if (PACK_EXPANSION_P (value))
6894 failure = complete_array_type (ptype, initial_value, do_default);
6896 /* We can create the array before the element type is complete, which
6897 means that we didn't have these two bits set in the original type
6898 either. In completing the type, we are expected to propagate these
6899 bits. See also complete_type which does the same thing for arrays
6902 if (TYPE_DOMAIN (type))
6904 elt_type = TREE_TYPE (type);
6905 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6906 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6907 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6913 /* As above, but either give an error or reject zero-size arrays, depending
6917 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6918 bool do_default, tsubst_flags_t complain)
6921 bool sfinae = !(complain & tf_error);
6922 /* In SFINAE context we can't be lenient about zero-size arrays. */
6925 failure = cp_complete_array_type (ptype, initial_value, do_default);
6931 /* Not an error. */;
6932 else if (failure == 1)
6933 error ("initializer fails to determine size of %qT", *ptype);
6934 else if (failure == 2)
6937 error ("array size missing in %qT", *ptype);
6939 else if (failure == 3)
6940 error ("zero-size array %qT", *ptype);
6941 *ptype = error_mark_node;
6946 /* Return zero if something is declared to be a member of type
6947 CTYPE when in the context of CUR_TYPE. STRING is the error
6948 message to print in that case. Otherwise, quietly return 1. */
6951 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6953 if (ctype && ctype != cur_type)
6955 if (flags == DTOR_FLAG)
6956 error ("destructor for alien class %qT cannot be a member", ctype);
6958 error ("constructor for alien class %qT cannot be a member", ctype);
6964 /* Subroutine of `grokdeclarator'. */
6966 /* Generate errors possibly applicable for a given set of specifiers.
6967 This is for ARM $7.1.2. */
6970 bad_specifiers (tree object,
6971 enum bad_spec_place type,
6982 error ("%qD declared as a %<virtual%> variable", object);
6984 error ("%qD declared as an %<inline%> variable", object);
6986 error ("%<const%> and %<volatile%> function specifiers on "
6987 "%qD invalid in variable declaration", object);
6991 error ("%qD declared as a %<virtual%> parameter", object);
6993 error ("%qD declared as an %<inline%> parameter", object);
6995 error ("%<const%> and %<volatile%> function specifiers on "
6996 "%qD invalid in parameter declaration", object);
7000 error ("%qD declared as a %<virtual%> type", object);
7002 error ("%qD declared as an %<inline%> type", object);
7004 error ("%<const%> and %<volatile%> function specifiers on "
7005 "%qD invalid in type declaration", object);
7009 error ("%qD declared as a %<virtual%> field", object);
7011 error ("%qD declared as an %<inline%> field", object);
7013 error ("%<const%> and %<volatile%> function specifiers on "
7014 "%qD invalid in field declaration", object);
7020 error ("%q+D declared as a friend", object);
7022 && (TREE_CODE (object) == TYPE_DECL
7023 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7024 && !TYPE_REFFN_P (TREE_TYPE (object))
7025 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7026 error ("%q+D declared with an exception specification", object);
7029 /* DECL is a member function or static data member and is presently
7030 being defined. Check that the definition is taking place in a
7034 check_class_member_definition_namespace (tree decl)
7036 /* These checks only apply to member functions and static data
7038 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7039 || TREE_CODE (decl) == VAR_DECL);
7040 /* We check for problems with specializations in pt.c in
7041 check_specialization_namespace, where we can issue better
7043 if (processing_specialization)
7045 /* There are no restrictions on the placement of
7046 explicit instantiations. */
7047 if (processing_explicit_instantiation)
7051 A member function definition that appears outside of the
7052 class definition shall appear in a namespace scope enclosing
7053 the class definition.
7057 The definition for a static data member shall appear in a
7058 namespace scope enclosing the member's class definition. */
7059 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7060 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7061 decl, DECL_CONTEXT (decl));
7064 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7065 METHOD_TYPE for a non-static member function; QUALS are the
7066 cv-qualifiers that apply to the function. */
7069 build_this_parm (tree type, cp_cv_quals quals)
7074 cp_cv_quals this_quals;
7076 if (CLASS_TYPE_P (type))
7079 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7080 this_type = build_pointer_type (this_type);
7083 this_type = type_of_this_parm (type);
7084 /* The `this' parameter is implicitly `const'; it cannot be
7086 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7087 qual_type = cp_build_qualified_type (this_type, this_quals);
7088 parm = build_artificial_parm (this_identifier, qual_type);
7089 cp_apply_type_quals_to_decl (this_quals, parm);
7093 /* DECL is a static member function. Complain if it was declared
7094 with function-cv-quals. */
7097 check_static_quals (tree decl, cp_cv_quals quals)
7099 if (quals != TYPE_UNQUALIFIED)
7100 error ("static member function %q#D declared with type qualifiers",
7104 /* CTYPE is class type, or null if non-class.
7105 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7107 DECLARATOR is the function's name.
7108 PARMS is a chain of PARM_DECLs for the function.
7109 VIRTUALP is truthvalue of whether the function is virtual or not.
7110 FLAGS are to be passed through to `grokclassfn'.
7111 QUALS are qualifiers indicating whether the function is `const'
7113 RAISES is a list of exceptions that this function can raise.
7114 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7115 not look, and -1 if we should not call `grokclassfn' at all.
7117 SFK is the kind of special function (if any) for the new function.
7119 Returns `NULL_TREE' if something goes wrong, after issuing
7120 applicable error messages. */
7123 grokfndecl (tree ctype,
7127 tree orig_declarator,
7129 enum overload_flags flags,
7136 special_function_kind sfk,
7141 location_t location)
7144 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7148 type = build_exception_variant (type, raises);
7150 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7152 /* If we have an explicit location, use it, otherwise use whatever
7153 build_lang_decl used (probably input_location). */
7154 if (location != UNKNOWN_LOCATION)
7155 DECL_SOURCE_LOCATION (decl) = location;
7157 if (TREE_CODE (type) == METHOD_TYPE)
7160 parm = build_this_parm (type, quals);
7161 DECL_CHAIN (parm) = parms;
7164 DECL_ARGUMENTS (decl) = parms;
7165 for (t = parms; t; t = DECL_CHAIN (t))
7166 DECL_CONTEXT (t) = decl;
7167 /* Propagate volatile out from type to decl. */
7168 if (TYPE_VOLATILE (type))
7169 TREE_THIS_VOLATILE (decl) = 1;
7171 /* Setup decl according to sfk. */
7174 case sfk_constructor:
7175 case sfk_copy_constructor:
7176 case sfk_move_constructor:
7177 DECL_CONSTRUCTOR_P (decl) = 1;
7179 case sfk_destructor:
7180 DECL_DESTRUCTOR_P (decl) = 1;
7186 /* If pointers to member functions use the least significant bit to
7187 indicate whether a function is virtual, ensure a pointer
7188 to this function will have that bit clear. */
7189 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7190 && TREE_CODE (type) == METHOD_TYPE
7191 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7192 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7195 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7199 ("defining explicit specialization %qD in friend declaration",
7203 tree fns = TREE_OPERAND (orig_declarator, 0);
7204 tree args = TREE_OPERAND (orig_declarator, 1);
7206 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7208 /* Something like `template <class T> friend void f<T>()'. */
7209 error ("invalid use of template-id %qD in declaration "
7210 "of primary template",
7216 /* A friend declaration of the form friend void f<>(). Record
7217 the information in the TEMPLATE_ID_EXPR. */
7218 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7220 if (TREE_CODE (fns) == COMPONENT_REF)
7222 /* Due to bison parser ickiness, we will have already looked
7223 up an operator_name or PFUNCNAME within the current class
7224 (see template_id in parse.y). If the current class contains
7225 such a name, we'll get a COMPONENT_REF here. Undo that. */
7227 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7228 == current_class_type);
7229 fns = TREE_OPERAND (fns, 1);
7231 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7232 || TREE_CODE (fns) == OVERLOAD);
7233 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7235 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7236 if (TREE_PURPOSE (t)
7237 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7239 error ("default arguments are not allowed in declaration "
7240 "of friend template specialization %qD",
7247 error ("%<inline%> is not allowed in declaration of friend "
7248 "template specialization %qD",
7255 /* If this decl has namespace scope, set that up. */
7257 set_decl_namespace (decl, in_namespace, friendp);
7259 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7261 /* `main' and builtins have implicit 'C' linkage. */
7262 if ((MAIN_NAME_P (declarator)
7263 || (IDENTIFIER_LENGTH (declarator) > 10
7264 && IDENTIFIER_POINTER (declarator)[0] == '_'
7265 && IDENTIFIER_POINTER (declarator)[1] == '_'
7266 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7267 && current_lang_name == lang_name_cplusplus
7268 && ctype == NULL_TREE
7269 && DECL_FILE_SCOPE_P (decl))
7270 SET_DECL_LANGUAGE (decl, lang_c);
7272 /* Should probably propagate const out from type to decl I bet (mrs). */
7275 DECL_STATIC_FUNCTION_P (decl) = 1;
7276 DECL_CONTEXT (decl) = ctype;
7281 DECL_CONTEXT (decl) = ctype;
7283 check_class_member_definition_namespace (decl);
7286 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7288 if (processing_template_decl)
7289 error ("cannot declare %<::main%> to be a template");
7291 error ("cannot declare %<::main%> to be inline");
7293 error ("cannot declare %<::main%> to be static");
7298 /* Members of anonymous types and local classes have no linkage; make
7299 them internal. If a typedef is made later, this will be changed. */
7300 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7301 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7304 if (publicp && cxx_dialect == cxx98)
7306 /* [basic.link]: A name with no linkage (notably, the name of a class
7307 or enumeration declared in a local scope) shall not be used to
7308 declare an entity with linkage.
7310 DR 757 relaxes this restriction for C++0x. */
7311 t = no_linkage_check (TREE_TYPE (decl),
7312 /*relaxed_p=*/false);
7315 if (TYPE_ANONYMOUS_P (t))
7317 if (DECL_EXTERN_C_P (decl))
7318 /* Allow this; it's pretty common in C. */;
7321 permerror (input_location, "anonymous type with no linkage "
7322 "used to declare function %q#D with linkage",
7324 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7325 permerror (input_location, "%q+#D does not refer to the unqualified "
7326 "type, so it is not used for linkage",
7331 permerror (input_location, "type %qT with no linkage used to "
7332 "declare function %q#D with linkage", t, decl);
7336 TREE_PUBLIC (decl) = publicp;
7339 DECL_INTERFACE_KNOWN (decl) = 1;
7340 DECL_NOT_REALLY_EXTERN (decl) = 1;
7343 /* If the declaration was declared inline, mark it as such. */
7345 DECL_DECLARED_INLINE_P (decl) = 1;
7347 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7349 DECL_EXTERNAL (decl) = 1;
7350 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7353 ? G_("static member function %qD cannot have cv-qualifier")
7354 : G_("non-member function %qD cannot have cv-qualifier"),
7356 quals = TYPE_UNQUALIFIED;
7359 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7360 && !grok_op_properties (decl, /*complain=*/true))
7362 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7364 bool long_long_unsigned_p;
7366 const char *suffix = NULL;
7367 /* [over.literal]/6: Literal operators shall not have C linkage. */
7368 if (DECL_LANGUAGE (decl) == lang_c)
7370 error ("literal operator with C linkage");
7374 if (DECL_NAMESPACE_SCOPE_P (decl))
7376 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7379 error ("%qD has invalid argument list", decl);
7383 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7384 if (long_long_unsigned_p)
7386 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7387 warning (0, "integer suffix %<%s%>"
7388 " shadowed by implementation", suffix);
7390 else if (long_double_p)
7392 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7393 warning (0, "floating point suffix %<%s%>"
7394 " shadowed by implementation", suffix);
7399 error ("%qD must be a non-member function", decl);
7405 /* Make the init_value nonzero so pushdecl knows this is not
7406 tentative. error_mark_node is replaced later with the BLOCK. */
7407 DECL_INITIAL (decl) = error_mark_node;
7409 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7410 TREE_NOTHROW (decl) = 1;
7412 /* Caller will do the rest of this. */
7416 if (ctype != NULL_TREE)
7417 grokclassfn (ctype, decl, flags);
7419 decl = check_explicit_specialization (orig_declarator, decl,
7422 4 * (friendp != 0));
7423 if (decl == error_mark_node)
7426 if (DECL_STATIC_FUNCTION_P (decl))
7427 check_static_quals (decl, quals);
7431 cplus_decl_attributes (&decl, *attrlist, 0);
7432 *attrlist = NULL_TREE;
7435 /* Check main's type after attributes have been applied. */
7436 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7438 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7441 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7443 error ("%<::main%> must return %<int%>");
7444 newtype = build_function_type (integer_type_node, oldtypeargs);
7445 TREE_TYPE (decl) = newtype;
7448 check_main_parameter_types (decl);
7451 if (ctype != NULL_TREE
7452 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7455 tree old_decl = check_classfn (ctype, decl,
7456 (processing_template_decl
7457 > template_class_depth (ctype))
7458 ? current_template_parms
7461 if (old_decl == error_mark_node)
7469 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7470 /* Because grokfndecl is always supposed to return a
7471 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7472 here. We depend on our callers to figure out that its
7473 really a template that's being returned. */
7474 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7476 if (DECL_STATIC_FUNCTION_P (old_decl)
7477 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7479 /* Remove the `this' parm added by grokclassfn. */
7480 revert_static_member_fn (decl);
7481 check_static_quals (decl, quals);
7483 if (DECL_ARTIFICIAL (old_decl))
7485 error ("definition of implicitly-declared %qD", old_decl);
7488 else if (DECL_DEFAULTED_FN (old_decl))
7490 error ("definition of explicitly-defaulted %q+D", decl);
7491 error ("%q+#D explicitly defaulted here", old_decl);
7495 /* Since we've smashed OLD_DECL to its
7496 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7497 if (TREE_CODE (decl) == TEMPLATE_DECL)
7498 decl = DECL_TEMPLATE_RESULT (decl);
7500 /* Attempt to merge the declarations. This can fail, in
7501 the case of some invalid specialization declarations. */
7502 pushed_scope = push_scope (ctype);
7503 ok = duplicate_decls (decl, old_decl, friendp);
7505 pop_scope (pushed_scope);
7508 error ("no %q#D member function declared in class %qT",
7516 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7519 if (ctype == NULL_TREE || check)
7523 DECL_VIRTUAL_P (decl) = 1;
7528 /* decl is a FUNCTION_DECL.
7529 specifiers are the parsed virt-specifiers.
7531 Set flags to reflect the virt-specifiers.
7536 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7538 if (decl == NULL_TREE)
7540 if (specifiers & VIRT_SPEC_OVERRIDE)
7541 DECL_OVERRIDE_P (decl) = 1;
7542 if (specifiers & VIRT_SPEC_FINAL)
7543 DECL_FINAL_P (decl) = 1;
7547 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7548 the linkage that DECL will receive in the object file. */
7551 set_linkage_for_static_data_member (tree decl)
7553 /* A static data member always has static storage duration and
7554 external linkage. Note that static data members are forbidden in
7555 local classes -- the only situation in which a class has
7556 non-external linkage. */
7557 TREE_PUBLIC (decl) = 1;
7558 TREE_STATIC (decl) = 1;
7559 /* For non-template classes, static data members are always put
7560 out in exactly those files where they are defined, just as
7561 with ordinary namespace-scope variables. */
7562 if (!processing_template_decl)
7563 DECL_INTERFACE_KNOWN (decl) = 1;
7566 /* Create a VAR_DECL named NAME with the indicated TYPE.
7568 If SCOPE is non-NULL, it is the class type or namespace containing
7569 the variable. If SCOPE is NULL, the variable should is created in
7570 the innermost enclosings scope. */
7573 grokvardecl (tree type,
7575 const cp_decl_specifier_seq *declspecs,
7581 tree explicit_scope;
7583 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7585 /* Compute the scope in which to place the variable, but remember
7586 whether or not that scope was explicitly specified by the user. */
7587 explicit_scope = scope;
7590 /* An explicit "extern" specifier indicates a namespace-scope
7592 if (declspecs->storage_class == sc_extern)
7593 scope = current_decl_namespace ();
7594 else if (!at_function_scope_p ())
7595 scope = current_scope ();
7599 && (/* If the variable is a namespace-scope variable declared in a
7600 template, we need DECL_LANG_SPECIFIC. */
7601 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7602 /* Similarly for namespace-scope variables with language linkage
7604 || (TREE_CODE (scope) == NAMESPACE_DECL
7605 && current_lang_name != lang_name_cplusplus)
7606 /* Similarly for static data members. */
7608 decl = build_lang_decl (VAR_DECL, name, type);
7610 decl = build_decl (input_location, VAR_DECL, name, type);
7612 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7613 set_decl_namespace (decl, explicit_scope, 0);
7615 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7617 if (declspecs->storage_class == sc_extern)
7619 DECL_THIS_EXTERN (decl) = 1;
7620 DECL_EXTERNAL (decl) = !initialized;
7623 if (DECL_CLASS_SCOPE_P (decl))
7625 set_linkage_for_static_data_member (decl);
7626 /* This function is only called with out-of-class definitions. */
7627 DECL_EXTERNAL (decl) = 0;
7628 check_class_member_definition_namespace (decl);
7630 /* At top level, either `static' or no s.c. makes a definition
7631 (perhaps tentative), and absence of `static' makes it public. */
7632 else if (toplevel_bindings_p ())
7634 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7635 && (DECL_THIS_EXTERN (decl) || ! constp));
7636 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7638 /* Not at top level, only `static' makes a static definition. */
7641 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7642 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7645 if (declspecs->specs[(int)ds_thread])
7646 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7648 /* If the type of the decl has no linkage, make sure that we'll
7649 notice that in mark_used. */
7650 if (cxx_dialect > cxx98
7651 && decl_linkage (decl) != lk_none
7652 && DECL_LANG_SPECIFIC (decl) == NULL
7653 && !DECL_EXTERN_C_P (decl)
7654 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7655 retrofit_lang_decl (decl);
7657 if (TREE_PUBLIC (decl))
7659 /* [basic.link]: A name with no linkage (notably, the name of a class
7660 or enumeration declared in a local scope) shall not be used to
7661 declare an entity with linkage.
7663 DR 757 relaxes this restriction for C++0x. */
7664 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7665 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7668 if (TYPE_ANONYMOUS_P (t))
7670 if (DECL_EXTERN_C_P (decl))
7671 /* Allow this; it's pretty common in C. */
7675 /* DRs 132, 319 and 389 seem to indicate types with
7676 no linkage can only be used to declare extern "C"
7677 entities. Since it's not always an error in the
7678 ISO C++ 90 Standard, we only issue a warning. */
7679 warning (0, "anonymous type with no linkage used to declare "
7680 "variable %q#D with linkage", decl);
7681 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7682 warning (0, "%q+#D does not refer to the unqualified "
7683 "type, so it is not used for linkage",
7688 warning (0, "type %qT with no linkage used to declare variable "
7689 "%q#D with linkage", t, decl);
7693 DECL_INTERFACE_KNOWN (decl) = 1;
7698 /* Create and return a canonical pointer to member function type, for
7699 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7702 build_ptrmemfunc_type (tree type)
7706 tree unqualified_variant = NULL_TREE;
7708 if (type == error_mark_node)
7711 /* If a canonical type already exists for this type, use it. We use
7712 this method instead of type_hash_canon, because it only does a
7713 simple equality check on the list of field members. */
7715 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7718 /* Make sure that we always have the unqualified pointer-to-member
7720 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7722 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7724 t = make_class_type (RECORD_TYPE);
7725 xref_basetypes (t, NULL_TREE);
7727 /* Let the front end know this is a pointer to member function... */
7728 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7729 /* ... and not really a class type. */
7730 SET_CLASS_TYPE_P (t, 0);
7732 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7735 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7737 DECL_CHAIN (field) = fields;
7740 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7742 /* Zap out the name so that the back end will give us the debugging
7743 information for this anonymous RECORD_TYPE. */
7744 TYPE_NAME (t) = NULL_TREE;
7746 /* If this is not the unqualified form of this pointer-to-member
7747 type, set the TYPE_MAIN_VARIANT for this type to be the
7748 unqualified type. Since they are actually RECORD_TYPEs that are
7749 not variants of each other, we must do this manually.
7750 As we just built a new type there is no need to do yet another copy. */
7751 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7753 int type_quals = cp_type_quals (type);
7754 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7755 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7756 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7757 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7758 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7759 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7760 TREE_TYPE (TYPE_BINFO (t)) = t;
7763 /* Cache this pointer-to-member type so that we can find it again
7765 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7767 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7768 SET_TYPE_STRUCTURAL_EQUALITY (t);
7769 else if (TYPE_CANONICAL (type) != type)
7770 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7775 /* Create and return a pointer to data member type. */
7778 build_ptrmem_type (tree class_type, tree member_type)
7780 if (TREE_CODE (member_type) == METHOD_TYPE)
7782 cp_cv_quals quals = type_memfn_quals (member_type);
7783 member_type = build_memfn_type (member_type, class_type, quals);
7784 return build_ptrmemfunc_type (build_pointer_type (member_type));
7788 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7789 return build_offset_type (class_type, member_type);
7793 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7794 Check to see that the definition is valid. Issue appropriate error
7795 messages. Return 1 if the definition is particularly bad, or 0
7799 check_static_variable_definition (tree decl, tree type)
7801 /* Can't check yet if we don't know the type. */
7802 if (dependent_type_p (type))
7804 /* If DECL is declared constexpr, we'll do the appropriate checks
7805 in check_initializer. */
7806 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7808 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7810 if (literal_type_p (type))
7811 permerror (input_location,
7812 "%<constexpr%> needed for in-class initialization of "
7813 "static data member %q#D of non-integral type", decl);
7815 error ("in-class initialization of static data member %q#D of "
7816 "non-literal type", decl);
7820 /* Motion 10 at San Diego: If a static const integral data member is
7821 initialized with an integral constant expression, the initializer
7822 may appear either in the declaration (within the class), or in
7823 the definition, but not both. If it appears in the class, the
7824 member is a member constant. The file-scope definition is always
7826 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7828 error ("invalid in-class initialization of static data member "
7829 "of non-integral type %qT",
7833 else if (!CP_TYPE_CONST_P (type))
7834 error ("ISO C++ forbids in-class initialization of non-const "
7835 "static member %qD",
7837 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7838 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7839 "%qD of non-integral type %qT", decl, type);
7844 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7845 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7846 expressions out into temporary variables so that walk_tree doesn't
7847 step into them (c++/15764). */
7850 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7852 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7853 tree expr = *expr_p;
7854 if (TREE_CODE (expr) == SAVE_EXPR)
7856 tree op = TREE_OPERAND (expr, 0);
7857 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7858 if (TREE_SIDE_EFFECTS (op))
7859 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7862 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7867 /* Entry point for the above. */
7870 stabilize_vla_size (tree size)
7872 struct pointer_set_t *pset = pointer_set_create ();
7873 /* Break out any function calls into temporary variables. */
7874 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7877 /* Given the SIZE (i.e., number of elements) in an array, compute an
7878 appropriate index type for the array. If non-NULL, NAME is the
7879 name of the thing being declared. */
7882 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7887 tree abi_1_itype = NULL_TREE;
7889 if (error_operand_p (size))
7890 return error_mark_node;
7892 type = TREE_TYPE (size);
7893 /* type_dependent_expression_p? */
7894 if (!dependent_type_p (type))
7896 mark_rvalue_use (size);
7898 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7899 && TREE_SIDE_EFFECTS (size))
7900 /* In C++98, we mark a non-constant array bound with a magic
7901 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7904 size = fold_non_dependent_expr (size);
7906 if (CLASS_TYPE_P (type)
7907 && CLASSTYPE_LITERAL_P (type))
7909 size = build_expr_type_conversion (WANT_INT, size, true);
7912 if (!(complain & tf_error))
7913 return error_mark_node;
7915 error ("size of array %qD has non-integral type %qT",
7918 error ("size of array has non-integral type %qT", type);
7919 size = integer_one_node;
7921 if (size == error_mark_node)
7922 return error_mark_node;
7923 type = TREE_TYPE (size);
7924 /* We didn't support this case in GCC 3.2, so don't bother
7925 trying to model it now in ABI v1. */
7926 abi_1_itype = error_mark_node;
7929 size = maybe_constant_value (size);
7930 if (!TREE_CONSTANT (size))
7934 if (error_operand_p (size))
7935 return error_mark_node;
7937 /* The array bound must be an integer type. */
7938 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7940 if (!(complain & tf_error))
7941 return error_mark_node;
7943 error ("size of array %qD has non-integral type %qT", name, type);
7945 error ("size of array has non-integral type %qT", type);
7946 size = integer_one_node;
7947 type = TREE_TYPE (size);
7951 /* A type is dependent if it is...an array type constructed from any
7952 dependent type or whose size is specified by a constant expression
7953 that is value-dependent. */
7954 /* We can only call value_dependent_expression_p on integral constant
7955 expressions; treat non-constant expressions as dependent, too. */
7956 if (processing_template_decl
7957 && (dependent_type_p (type)
7958 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7960 /* We cannot do any checking for a SIZE that isn't known to be
7961 constant. Just build the index type and mark that it requires
7962 structural equality checks. */
7963 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7964 size, integer_one_node));
7965 TYPE_DEPENDENT_P (itype) = 1;
7966 TYPE_DEPENDENT_P_VALID (itype) = 1;
7967 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7971 if (!abi_version_at_least (2) && processing_template_decl
7972 && abi_1_itype == NULL_TREE)
7973 /* For abi-1, we handled all instances in templates the same way,
7974 even when they were non-dependent. This affects the manglings
7975 produced. So, we do the normal checking for non-dependent
7976 sizes, but at the end we'll return the same type that abi-1
7977 would have, but with TYPE_CANONICAL set to the "right"
7978 value that the current ABI would provide. */
7979 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7980 osize, integer_one_node));
7982 /* Normally, the array-bound will be a constant. */
7983 if (TREE_CODE (size) == INTEGER_CST)
7985 /* Check to see if the array bound overflowed. Make that an
7986 error, no matter how generous we're being. */
7987 constant_expression_error (size);
7989 /* An array must have a positive number of elements. */
7990 if (INT_CST_LT (size, integer_zero_node))
7992 if (!(complain & tf_error))
7993 return error_mark_node;
7995 error ("size of array %qD is negative", name);
7997 error ("size of array is negative");
7998 size = integer_one_node;
8000 /* As an extension we allow zero-sized arrays. */
8001 else if (integer_zerop (size))
8003 if (!(complain & tf_error))
8004 /* We must fail if performing argument deduction (as
8005 indicated by the state of complain), so that
8006 another substitution can be found. */
8007 return error_mark_node;
8008 else if (in_system_header)
8009 /* Allow them in system headers because glibc uses them. */;
8011 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
8013 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
8016 else if (TREE_CONSTANT (size)
8017 /* We don't allow VLAs at non-function scopes, or during
8018 tentative template substitution. */
8019 || !at_function_scope_p () || !(complain & tf_error))
8021 if (!(complain & tf_error))
8022 return error_mark_node;
8023 /* `(int) &fn' is not a valid array bound. */
8025 error ("size of array %qD is not an integral constant-expression",
8028 error ("size of array is not an integral constant-expression");
8029 size = integer_one_node;
8031 else if (pedantic && warn_vla != 0)
8034 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8036 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8038 else if (warn_vla > 0)
8042 "variable length array %qD is used", name);
8045 "variable length array is used");
8048 if (processing_template_decl && !TREE_CONSTANT (size))
8049 /* A variable sized array. */
8050 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8053 HOST_WIDE_INT saved_processing_template_decl;
8055 /* Compute the index of the largest element in the array. It is
8056 one less than the number of elements in the array. We save
8057 and restore PROCESSING_TEMPLATE_DECL so that computations in
8058 cp_build_binary_op will be appropriately folded. */
8059 saved_processing_template_decl = processing_template_decl;
8060 processing_template_decl = 0;
8061 itype = cp_build_binary_op (input_location,
8063 cp_convert (ssizetype, size),
8064 cp_convert (ssizetype, integer_one_node),
8065 tf_warning_or_error);
8066 itype = fold (itype);
8067 processing_template_decl = saved_processing_template_decl;
8069 if (!TREE_CONSTANT (itype))
8070 /* A variable sized array. */
8071 itype = variable_size (itype);
8072 /* Make sure that there was no overflow when creating to a signed
8073 index type. (For example, on a 32-bit machine, an array with
8074 size 2^32 - 1 is too big.) */
8075 else if (TREE_CODE (itype) == INTEGER_CST
8076 && TREE_OVERFLOW (itype))
8078 if (!(complain & tf_error))
8079 return error_mark_node;
8080 error ("overflow in array dimension");
8081 TREE_OVERFLOW (itype) = 0;
8085 /* Create and return the appropriate index type. */
8086 if (abi_1_itype && abi_1_itype != error_mark_node)
8088 tree t = build_index_type (itype);
8089 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8090 itype = abi_1_itype;
8093 itype = build_index_type (itype);
8095 /* If the index type were dependent, we would have returned early, so
8096 remember that it isn't. */
8097 TYPE_DEPENDENT_P (itype) = 0;
8098 TYPE_DEPENDENT_P_VALID (itype) = 1;
8102 /* Returns the scope (if any) in which the entity declared by
8103 DECLARATOR will be located. If the entity was declared with an
8104 unqualified name, NULL_TREE is returned. */
8107 get_scope_of_declarator (const cp_declarator *declarator)
8109 while (declarator && declarator->kind != cdk_id)
8110 declarator = declarator->declarator;
8112 /* If the declarator-id is a SCOPE_REF, the scope in which the
8113 declaration occurs is the first operand. */
8115 && declarator->u.id.qualifying_scope)
8116 return declarator->u.id.qualifying_scope;
8118 /* Otherwise, the declarator is not a qualified name; the entity will
8119 be declared in the current scope. */
8123 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8124 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8128 create_array_type_for_decl (tree name, tree type, tree size)
8130 tree itype = NULL_TREE;
8132 /* If things have already gone awry, bail now. */
8133 if (type == error_mark_node || size == error_mark_node)
8134 return error_mark_node;
8136 /* 8.3.4/1: If the type of the identifier of D contains the auto
8137 type-specifier, the program is ill-formed. */
8138 if (pedantic && type_uses_auto (type))
8139 pedwarn (input_location, OPT_pedantic,
8140 "declaration of %qD as array of %<auto%>", name);
8142 /* If there are some types which cannot be array elements,
8143 issue an error-message and return. */
8144 switch (TREE_CODE (type))
8148 error ("declaration of %qD as array of void", name);
8150 error ("creating array of void");
8151 return error_mark_node;
8155 error ("declaration of %qD as array of functions", name);
8157 error ("creating array of functions");
8158 return error_mark_node;
8160 case REFERENCE_TYPE:
8162 error ("declaration of %qD as array of references", name);
8164 error ("creating array of references");
8165 return error_mark_node;
8169 error ("declaration of %qD as array of function members", name);
8171 error ("creating array of function members");
8172 return error_mark_node;
8180 The constant expressions that specify the bounds of the arrays
8181 can be omitted only for the first member of the sequence. */
8182 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8185 error ("declaration of %qD as multidimensional array must "
8186 "have bounds for all dimensions except the first",
8189 error ("multidimensional array must have bounds for all "
8190 "dimensions except the first");
8192 return error_mark_node;
8195 /* Figure out the index type for the array. */
8197 itype = compute_array_index_type (name, size, tf_warning_or_error);
8200 T is called the array element type; this type shall not be [...] an
8201 abstract class type. */
8202 abstract_virtuals_error (name, type);
8204 return build_cplus_array_type (type, itype);
8207 /* Check that it's OK to declare a function with the indicated TYPE.
8208 SFK indicates the kind of special function (if any) that this
8209 function is. OPTYPE is the type given in a conversion operator
8210 declaration, or the class type for a constructor/destructor.
8211 Returns the actual return type of the function; that
8212 may be different than TYPE if an error occurs, or for certain
8213 special functions. */
8216 check_special_function_return_type (special_function_kind sfk,
8222 case sfk_constructor:
8224 error ("return type specification for constructor invalid");
8226 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8227 type = build_pointer_type (optype);
8229 type = void_type_node;
8232 case sfk_destructor:
8234 error ("return type specification for destructor invalid");
8235 /* We can't use the proper return type here because we run into
8236 problems with ambiguous bases and covariant returns.
8237 Java classes are left unchanged because (void *) isn't a valid
8238 Java type, and we don't want to change the Java ABI. */
8239 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8240 type = build_pointer_type (void_type_node);
8242 type = void_type_node;
8245 case sfk_conversion:
8247 error ("return type specified for %<operator %T%>", optype);
8258 /* A variable or data member (whose unqualified name is IDENTIFIER)
8259 has been declared with the indicated TYPE. If the TYPE is not
8260 acceptable, issue an error message and return a type to use for
8261 error-recovery purposes. */
8264 check_var_type (tree identifier, tree type)
8266 if (VOID_TYPE_P (type))
8269 error ("unnamed variable or field declared void");
8270 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8272 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8273 error ("variable or field %qE declared void", identifier);
8276 error ("variable or field declared void");
8277 type = error_mark_node;
8283 /* Given declspecs and a declarator (abstract or otherwise), determine
8284 the name and type of the object declared and construct a DECL node
8287 DECLSPECS points to the representation of declaration-specifier
8288 sequence that precedes declarator.
8290 DECL_CONTEXT says which syntactic context this declaration is in:
8291 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8292 FUNCDEF for a function definition. Like NORMAL but a few different
8293 error messages in each case. Return value may be zero meaning
8294 this definition is too screwy to try to parse.
8295 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8296 handle member functions (which have FIELD context).
8297 Return value may be zero meaning this definition is too screwy to
8299 PARM for a parameter declaration (either within a function prototype
8300 or before a function body). Make a PARM_DECL, or return void_type_node.
8301 TPARM for a template parameter declaration.
8302 CATCHPARM for a parameter declaration before a catch clause.
8303 TYPENAME if for a typename (in a cast or sizeof).
8304 Don't make a DECL node; just return the ..._TYPE node.
8305 FIELD for a struct or union field; make a FIELD_DECL.
8306 BITFIELD for a field with specified width.
8308 INITIALIZED is as for start_decl.
8310 ATTRLIST is a pointer to the list of attributes, which may be NULL
8311 if there are none; *ATTRLIST may be modified if attributes from inside
8312 the declarator should be applied to the declaration.
8314 When this function is called, scoping variables (such as
8315 CURRENT_CLASS_TYPE) should reflect the scope in which the
8316 declaration occurs, not the scope in which the new declaration will
8317 be placed. For example, on:
8321 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8324 Returns a DECL (if a declarator is present), a TYPE (if there is no
8325 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8329 grokdeclarator (const cp_declarator *declarator,
8330 const cp_decl_specifier_seq *declspecs,
8331 enum decl_context decl_context,
8335 tree type = NULL_TREE;
8337 int explicit_int128 = 0;
8338 int virtualp, explicitp, friendp, inlinep, staticp;
8339 int explicit_int = 0;
8340 int explicit_char = 0;
8341 int defaulted_int = 0;
8342 tree dependent_name = NULL_TREE;
8344 tree typedef_decl = NULL_TREE;
8345 const char *name = NULL;
8346 tree typedef_type = NULL_TREE;
8347 /* True if this declarator is a function definition. */
8348 bool funcdef_flag = false;
8349 cp_declarator_kind innermost_code = cdk_error;
8352 /* See the code below that used this. */
8353 tree decl_attr = NULL_TREE;
8356 /* Keep track of what sort of function is being processed
8357 so that we can warn about default return values, or explicit
8358 return values which do not match prescribed defaults. */
8359 special_function_kind sfk = sfk_none;
8361 tree dname = NULL_TREE;
8362 tree ctor_return_type = NULL_TREE;
8363 enum overload_flags flags = NO_SPECIAL;
8364 /* cv-qualifiers that apply to the declarator, for a declaration of
8365 a member function. */
8366 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8367 /* virt-specifiers that apply to the declarator, for a declaration of
8368 a member function. */
8369 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8370 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8372 tree raises = NULL_TREE;
8373 int template_count = 0;
8374 tree returned_attrs = NULL_TREE;
8375 tree parms = NULL_TREE;
8376 const cp_declarator *id_declarator;
8377 /* The unqualified name of the declarator; either an
8378 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8379 tree unqualified_id;
8380 /* The class type, if any, in which this entity is located,
8381 or NULL_TREE if none. Note that this value may be different from
8382 the current class type; for example if an attempt is made to declare
8383 "A::f" inside "B", this value will be "A". */
8384 tree ctype = current_class_type;
8385 /* The NAMESPACE_DECL for the namespace in which this entity is
8386 located. If an unqualified name is used to declare the entity,
8387 this value will be NULL_TREE, even if the entity is located at
8389 tree in_namespace = NULL_TREE;
8390 cp_storage_class storage_class;
8391 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8392 bool type_was_error_mark_node = false;
8393 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8394 bool template_type_arg = false;
8395 bool template_parm_flag = false;
8396 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8399 signed_p = declspecs->specs[(int)ds_signed];
8400 unsigned_p = declspecs->specs[(int)ds_unsigned];
8401 short_p = declspecs->specs[(int)ds_short];
8402 long_p = declspecs->specs[(int)ds_long];
8403 longlong = declspecs->specs[(int)ds_long] >= 2;
8404 explicit_int128 = declspecs->explicit_int128_p;
8405 thread_p = declspecs->specs[(int)ds_thread];
8407 if (decl_context == FUNCDEF)
8408 funcdef_flag = true, decl_context = NORMAL;
8409 else if (decl_context == MEMFUNCDEF)
8410 funcdef_flag = true, decl_context = FIELD;
8411 else if (decl_context == BITFIELD)
8412 bitfield = 1, decl_context = FIELD;
8413 else if (decl_context == TEMPLATE_TYPE_ARG)
8414 template_type_arg = true, decl_context = TYPENAME;
8415 else if (decl_context == TPARM)
8416 template_parm_flag = true, decl_context = PARM;
8418 if (initialized > 1)
8419 funcdef_flag = true;
8421 /* Look inside a declarator for the name being declared
8422 and get it as a string, for an error message. */
8423 for (id_declarator = declarator;
8425 id_declarator = id_declarator->declarator)
8427 if (id_declarator->kind != cdk_id)
8428 innermost_code = id_declarator->kind;
8430 switch (id_declarator->kind)
8433 if (id_declarator->declarator
8434 && id_declarator->declarator->kind == cdk_id)
8436 sfk = id_declarator->declarator->u.id.sfk;
8437 if (sfk == sfk_destructor)
8444 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8445 tree decl = id_declarator->u.id.unqualified_name;
8448 if (qualifying_scope)
8450 if (at_function_scope_p ())
8454 A declarator-id shall not be qualified except
8457 None of the cases are permitted in block
8459 if (qualifying_scope == global_namespace)
8460 error ("invalid use of qualified-name %<::%D%>",
8462 else if (TYPE_P (qualifying_scope))
8463 error ("invalid use of qualified-name %<%T::%D%>",
8464 qualifying_scope, decl);
8466 error ("invalid use of qualified-name %<%D::%D%>",
8467 qualifying_scope, decl);
8468 return error_mark_node;
8470 else if (TYPE_P (qualifying_scope))
8472 ctype = qualifying_scope;
8473 if (!MAYBE_CLASS_TYPE_P (ctype))
8475 error ("%q#T is not a class or a namespace", ctype);
8478 else if (innermost_code != cdk_function
8479 && current_class_type
8480 && !UNIQUELY_DERIVED_FROM_P (ctype,
8481 current_class_type))
8483 error ("type %qT is not derived from type %qT",
8484 ctype, current_class_type);
8485 return error_mark_node;
8488 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8489 in_namespace = qualifying_scope;
8491 switch (TREE_CODE (decl))
8497 if (innermost_code != cdk_function)
8499 error ("declaration of %qD as non-function", decl);
8500 return error_mark_node;
8502 else if (!qualifying_scope
8503 && !(current_class_type && at_class_scope_p ()))
8505 error ("declaration of %qD as non-member", decl);
8506 return error_mark_node;
8509 type = TREE_OPERAND (decl, 0);
8511 type = constructor_name (type);
8512 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8517 case TEMPLATE_ID_EXPR:
8519 tree fns = TREE_OPERAND (decl, 0);
8522 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8524 gcc_assert (is_overloaded_fn (dname));
8525 dname = DECL_NAME (get_first_fn (dname));
8530 case IDENTIFIER_NODE:
8531 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8534 if (C_IS_RESERVED_WORD (dname))
8536 error ("declarator-id missing; using reserved word %qD",
8538 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8540 else if (!IDENTIFIER_TYPENAME_P (dname))
8541 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8544 gcc_assert (flags == NO_SPECIAL);
8545 flags = TYPENAME_FLAG;
8546 ctor_return_type = TREE_TYPE (dname);
8547 sfk = sfk_conversion;
8548 if (is_typename_at_global_scope (dname))
8549 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8551 name = "<invalid operator>";
8568 return error_mark_node;
8573 if (id_declarator->kind == cdk_id)
8579 The declarator in a function-definition shall have the form
8580 D1 ( parameter-declaration-clause) ... */
8581 if (funcdef_flag && innermost_code != cdk_function)
8583 error ("function definition does not declare parameters");
8584 return error_mark_node;
8587 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8588 && innermost_code != cdk_function
8589 && ! (ctype && !declspecs->any_specifiers_p))
8591 error ("declaration of %qD as non-function", dname);
8592 return error_mark_node;
8596 && TREE_CODE (dname) == IDENTIFIER_NODE
8597 && UDLIT_OPER_P (dname)
8598 && innermost_code != cdk_function)
8600 error ("declaration of %qD as non-function", dname);
8601 return error_mark_node;
8604 if (dname && IDENTIFIER_OPNAME_P (dname))
8606 if (declspecs->specs[(int)ds_typedef])
8608 error ("declaration of %qD as %<typedef%>", dname);
8609 return error_mark_node;
8611 else if (decl_context == PARM || decl_context == CATCHPARM)
8613 error ("declaration of %qD as parameter", dname);
8614 return error_mark_node;
8618 /* Anything declared one level down from the top level
8619 must be one of the parameters of a function
8620 (because the body is at least two levels down). */
8622 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8623 by not allowing C++ class definitions to specify their parameters
8624 with xdecls (must be spec.d in the parmlist).
8626 Since we now wait to push a class scope until we are sure that
8627 we are in a legitimate method context, we must set oldcname
8628 explicitly (since current_class_name is not yet alive).
8630 We also want to avoid calling this a PARM if it is in a namespace. */
8632 if (decl_context == NORMAL && !toplevel_bindings_p ())
8634 cp_binding_level *b = current_binding_level;
8635 current_binding_level = b->level_chain;
8636 if (current_binding_level != 0 && toplevel_bindings_p ())
8637 decl_context = PARM;
8638 current_binding_level = b;
8642 name = decl_context == PARM ? "parameter" : "type name";
8644 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8646 error ("%<constexpr%> cannot appear in a typedef declaration");
8647 return error_mark_node;
8650 /* If there were multiple types specified in the decl-specifier-seq,
8651 issue an error message. */
8652 if (declspecs->multiple_types_p)
8654 error ("two or more data types in declaration of %qs", name);
8655 return error_mark_node;
8658 if (declspecs->conflicting_specifiers_p)
8660 error ("conflicting specifiers in declaration of %qs", name);
8661 return error_mark_node;
8664 /* Extract the basic type from the decl-specifier-seq. */
8665 type = declspecs->type;
8666 if (type == error_mark_node)
8669 type_was_error_mark_node = true;
8671 /* If the entire declaration is itself tagged as deprecated then
8672 suppress reports of deprecated items. */
8673 if (type && TREE_DEPRECATED (type)
8674 && deprecated_state != DEPRECATED_SUPPRESS)
8675 warn_deprecated_use (type, NULL_TREE);
8676 if (type && TREE_CODE (type) == TYPE_DECL)
8678 typedef_decl = type;
8679 type = TREE_TYPE (typedef_decl);
8680 if (TREE_DEPRECATED (type)
8681 && DECL_ARTIFICIAL (typedef_decl)
8682 && deprecated_state != DEPRECATED_SUPPRESS)
8683 warn_deprecated_use (type, NULL_TREE);
8685 /* No type at all: default to `int', and set DEFAULTED_INT
8686 because it was not a user-defined typedef. */
8687 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8689 /* These imply 'int'. */
8690 type = integer_type_node;
8694 explicit_int = declspecs->explicit_int_p;
8695 explicit_char = declspecs->explicit_char_p;
8698 /* See the code below that used this. */
8700 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8702 typedef_type = type;
8705 if (sfk != sfk_conversion)
8706 ctor_return_type = ctype;
8708 if (sfk != sfk_none)
8709 type = check_special_function_return_type (sfk, type,
8711 else if (type == NULL_TREE)
8717 /* We handle `main' specially here, because 'main () { }' is so
8718 common. With no options, it is allowed. With -Wreturn-type,
8719 it is a warning. It is only an error with -pedantic-errors. */
8720 is_main = (funcdef_flag
8721 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8722 && MAIN_NAME_P (dname)
8723 && ctype == NULL_TREE
8724 && in_namespace == NULL_TREE
8725 && current_namespace == global_namespace);
8727 if (type_was_error_mark_node)
8728 /* We've already issued an error, don't complain more. */;
8729 else if (in_system_header || flag_ms_extensions)
8730 /* Allow it, sigh. */;
8732 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8734 pedwarn (input_location, OPT_pedantic,
8735 "ISO C++ forbids declaration of %qs with no type", name);
8737 warning (OPT_Wreturn_type,
8738 "ISO C++ forbids declaration of %qs with no type", name);
8740 type = integer_type_node;
8745 if (explicit_int128)
8747 if (int128_integer_type_node == NULL_TREE)
8749 error ("%<__int128%> is not supported by this target");
8750 explicit_int128 = false;
8752 else if (pedantic && ! in_system_header)
8753 pedwarn (input_location, OPT_pedantic,
8754 "ISO C++ does not support %<__int128%> for %qs", name);
8757 /* Now process the modifiers that were specified
8758 and check for invalid combinations. */
8760 /* Long double is a special combination. */
8761 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8764 type = cp_build_qualified_type (long_double_type_node,
8765 cp_type_quals (type));
8768 /* Check all other uses of type modifiers. */
8770 if (unsigned_p || signed_p || long_p || short_p)
8774 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8775 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8776 else if (signed_p && unsigned_p)
8777 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8778 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8779 error ("%<long long%> invalid for %qs", name);
8780 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8781 error ("%<long%> invalid for %qs", name);
8782 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8783 error ("%<short%> invalid for %qs", name);
8784 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8785 error ("%<long%> or %<short%> invalid for %qs", name);
8786 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8787 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8788 else if ((long_p || short_p) && explicit_char)
8789 error ("%<long%> or %<short%> specified with char for %qs", name);
8790 else if (long_p && short_p)
8791 error ("%<long%> and %<short%> specified together for %qs", name);
8792 else if (type == char16_type_node || type == char32_type_node)
8794 if (signed_p || unsigned_p)
8795 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8796 else if (short_p || long_p)
8797 error ("%<short%> or %<long%> invalid for %qs", name);
8802 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8804 pedwarn (input_location, OPT_pedantic,
8805 "long, short, signed or unsigned used invalidly for %qs",
8807 if (flag_pedantic_errors)
8812 /* Discard the type modifiers if they are invalid. */
8823 /* Decide whether an integer type is signed or not.
8824 Optionally treat bitfields as signed by default. */
8828 It is implementation-defined whether a plain (neither
8829 explicitly signed or unsigned) char, short, int, or long
8830 bit-field is signed or unsigned.
8832 Naturally, we extend this to long long as well. Note that
8833 this does not include wchar_t. */
8834 || (bitfield && !flag_signed_bitfields
8836 /* A typedef for plain `int' without `signed' can be
8837 controlled just like plain `int', but a typedef for
8838 `signed int' cannot be so controlled. */
8840 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8841 && TREE_CODE (type) == INTEGER_TYPE
8842 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8844 if (explicit_int128)
8845 type = int128_unsigned_type_node;
8847 type = long_long_unsigned_type_node;
8849 type = long_unsigned_type_node;
8851 type = short_unsigned_type_node;
8852 else if (type == char_type_node)
8853 type = unsigned_char_type_node;
8854 else if (typedef_decl)
8855 type = unsigned_type_for (type);
8857 type = unsigned_type_node;
8859 else if (signed_p && type == char_type_node)
8860 type = signed_char_type_node;
8861 else if (explicit_int128)
8862 type = int128_integer_type_node;
8864 type = long_long_integer_type_node;
8866 type = long_integer_type_node;
8868 type = short_integer_type_node;
8870 if (declspecs->specs[(int)ds_complex])
8872 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8873 error ("complex invalid for %qs", name);
8874 /* If we just have "complex", it is equivalent to
8875 "complex double", but if any modifiers at all are specified it is
8876 the complex form of TYPE. E.g, "complex short" is
8877 "complex short int". */
8878 else if (defaulted_int && ! longlong && ! explicit_int128
8879 && ! (long_p || short_p || signed_p || unsigned_p))
8880 type = complex_double_type_node;
8881 else if (type == integer_type_node)
8882 type = complex_integer_type_node;
8883 else if (type == float_type_node)
8884 type = complex_float_type_node;
8885 else if (type == double_type_node)
8886 type = complex_double_type_node;
8887 else if (type == long_double_type_node)
8888 type = complex_long_double_type_node;
8890 type = build_complex_type (type);
8893 type_quals = TYPE_UNQUALIFIED;
8894 if (declspecs->specs[(int)ds_const])
8895 type_quals |= TYPE_QUAL_CONST;
8896 if (declspecs->specs[(int)ds_volatile])
8897 type_quals |= TYPE_QUAL_VOLATILE;
8898 if (declspecs->specs[(int)ds_restrict])
8899 type_quals |= TYPE_QUAL_RESTRICT;
8900 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8901 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8904 type_quals |= cp_type_quals (type);
8905 type = cp_build_qualified_type_real
8906 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8907 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8908 /* We might have ignored or rejected some of the qualifiers. */
8909 type_quals = cp_type_quals (type);
8912 inlinep = !! declspecs->specs[(int)ds_inline];
8913 virtualp = !! declspecs->specs[(int)ds_virtual];
8914 explicitp = !! declspecs->specs[(int)ds_explicit];
8916 storage_class = declspecs->storage_class;
8917 if (storage_class == sc_static)
8918 staticp = 1 + (decl_context == FIELD);
8920 if (virtualp && staticp == 2)
8922 error ("member %qD cannot be declared both virtual and static", dname);
8923 storage_class = sc_none;
8926 friendp = !! declspecs->specs[(int)ds_friend];
8928 if (dependent_name && !friendp)
8930 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8931 return error_mark_node;
8934 /* Issue errors about use of storage classes for parameters. */
8935 if (decl_context == PARM)
8937 if (declspecs->specs[(int)ds_typedef])
8939 error ("typedef declaration invalid in parameter declaration");
8940 return error_mark_node;
8942 else if (template_parm_flag && storage_class != sc_none)
8944 error ("storage class specified for template parameter %qs", name);
8945 return error_mark_node;
8947 else if (storage_class == sc_static
8948 || storage_class == sc_extern
8950 error ("storage class specifiers invalid in parameter declarations");
8952 /* Function parameters cannot be constexpr. If we saw one, moan
8953 and pretend it wasn't there. */
8956 error ("a parameter cannot be declared %<constexpr%>");
8961 /* Give error if `virtual' is used outside of class declaration. */
8963 && (current_class_name == NULL_TREE || decl_context != FIELD))
8965 error ("%<virtual%> outside class declaration");
8969 /* Static anonymous unions are dealt with here. */
8970 if (staticp && decl_context == TYPENAME
8972 && ANON_AGGR_TYPE_P (declspecs->type))
8973 decl_context = FIELD;
8975 /* Warn about storage classes that are invalid for certain
8976 kinds of declarations (parameters, typenames, etc.). */
8979 && storage_class != sc_extern
8980 && storage_class != sc_static)
8981 || declspecs->specs[(int)ds_typedef]))
8983 error ("multiple storage classes in declaration of %qs", name);
8986 if (decl_context != NORMAL
8987 && ((storage_class != sc_none
8988 && storage_class != sc_mutable)
8991 if ((decl_context == PARM || decl_context == CATCHPARM)
8992 && (storage_class == sc_register
8993 || storage_class == sc_auto))
8995 else if (declspecs->specs[(int)ds_typedef])
8997 else if (decl_context == FIELD
8998 /* C++ allows static class elements. */
8999 && storage_class == sc_static)
9000 /* C++ also allows inlines and signed and unsigned elements,
9001 but in those cases we don't come in here. */
9005 if (decl_context == FIELD)
9006 error ("storage class specified for %qs", name);
9009 if (decl_context == PARM || decl_context == CATCHPARM)
9010 error ("storage class specified for parameter %qs", name);
9012 error ("storage class specified for typename");
9014 if (storage_class == sc_register
9015 || storage_class == sc_auto
9016 || storage_class == sc_extern
9018 storage_class = sc_none;
9021 else if (storage_class == sc_extern && funcdef_flag
9022 && ! toplevel_bindings_p ())
9023 error ("nested function %qs declared %<extern%>", name);
9024 else if (toplevel_bindings_p ())
9026 if (storage_class == sc_auto)
9027 error ("top-level declaration of %qs specifies %<auto%>", name);
9030 && storage_class != sc_extern
9031 && storage_class != sc_static)
9033 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9038 if (storage_class && friendp)
9040 error ("storage class specifiers invalid in friend function declarations");
9041 storage_class = sc_none;
9046 unqualified_id = NULL_TREE;
9049 unqualified_id = id_declarator->u.id.unqualified_name;
9050 switch (TREE_CODE (unqualified_id))
9053 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9054 if (TYPE_P (unqualified_id))
9055 unqualified_id = constructor_name (unqualified_id);
9058 case IDENTIFIER_NODE:
9059 case TEMPLATE_ID_EXPR:
9067 /* Determine the type of the entity declared by recurring on the
9069 for (; declarator; declarator = declarator->declarator)
9071 const cp_declarator *inner_declarator;
9074 if (type == error_mark_node)
9075 return error_mark_node;
9077 attrs = declarator->attributes;
9083 if (declarator == NULL || declarator->kind == cdk_id)
9084 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9085 if (declarator->kind == cdk_function)
9086 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9087 if (declarator->kind == cdk_array)
9088 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9089 returned_attrs = decl_attributes (&type,
9090 chainon (returned_attrs, attrs),
9094 if (declarator->kind == cdk_id)
9097 inner_declarator = declarator->declarator;
9099 switch (declarator->kind)
9102 type = create_array_type_for_decl (dname, type,
9103 declarator->u.array.bounds);
9111 /* Declaring a function type.
9112 Make sure we have a valid type for the function to return. */
9114 if (type_quals != TYPE_UNQUALIFIED)
9116 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9117 warning (OPT_Wignored_qualifiers,
9118 "type qualifiers ignored on function return type");
9119 /* We now know that the TYPE_QUALS don't apply to the
9120 decl, but to its return type. */
9121 type_quals = TYPE_UNQUALIFIED;
9123 errmsg = targetm.invalid_return_type (type);
9127 type = integer_type_node;
9130 /* Error about some types functions can't return. */
9132 if (TREE_CODE (type) == FUNCTION_TYPE)
9134 error ("%qs declared as function returning a function", name);
9135 return error_mark_node;
9137 if (TREE_CODE (type) == ARRAY_TYPE)
9139 error ("%qs declared as function returning an array", name);
9140 return error_mark_node;
9143 /* Pick up type qualifiers which should be applied to `this'. */
9144 memfn_quals = declarator->u.function.qualifiers;
9145 /* Pick up virt-specifiers. */
9146 virt_specifiers = declarator->u.function.virt_specifiers;
9147 /* Pick up the exception specifications. */
9148 raises = declarator->u.function.exception_specification;
9149 /* If the exception-specification is ill-formed, let's pretend
9150 there wasn't one. */
9151 if (raises == error_mark_node)
9154 /* Say it's a definition only for the CALL_EXPR
9155 closest to the identifier. */
9156 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9158 /* Handle a late-specified return type. */
9161 if (type_uses_auto (type))
9163 if (!declarator->u.function.late_return_type)
9165 error ("%qs function uses %<auto%> type specifier without"
9166 " trailing return type", name);
9167 return error_mark_node;
9169 else if (!is_auto (type))
9171 error ("%qs function with trailing return type has"
9172 " %qT as its type rather than plain %<auto%>",
9174 return error_mark_node;
9177 else if (declarator->u.function.late_return_type)
9179 if (cxx_dialect < cxx0x)
9180 /* Not using maybe_warn_cpp0x because this should
9181 always be an error. */
9182 error ("trailing return type only available with "
9183 "-std=c++11 or -std=gnu++11");
9185 error ("%qs function with trailing return type not "
9186 "declared with %<auto%> type specifier", name);
9187 return error_mark_node;
9190 type = splice_late_return_type
9191 (type, declarator->u.function.late_return_type);
9192 if (type == error_mark_node)
9193 return error_mark_node;
9195 if (ctype == NULL_TREE
9196 && decl_context == FIELD
9198 && (friendp == 0 || dname == current_class_name))
9199 ctype = current_class_type;
9201 if (ctype && (sfk == sfk_constructor
9202 || sfk == sfk_destructor))
9204 /* We are within a class's scope. If our declarator name
9205 is the same as the class name, and we are defining
9206 a function, then it is a constructor/destructor, and
9207 therefore returns a void type. */
9209 /* ISO C++ 12.4/2. A destructor may not be declared
9210 const or volatile. A destructor may not be
9213 ISO C++ 12.1. A constructor may not be declared
9214 const or volatile. A constructor may not be
9215 virtual. A constructor may not be static. */
9217 error ((flags == DTOR_FLAG)
9218 ? G_("destructor cannot be static member function")
9219 : G_("constructor cannot be static member function"));
9222 error ((flags == DTOR_FLAG)
9223 ? G_("destructors may not be cv-qualified")
9224 : G_("constructors may not be cv-qualified"));
9225 memfn_quals = TYPE_UNQUALIFIED;
9228 if (decl_context == FIELD
9229 && !member_function_or_else (ctype,
9232 return error_mark_node;
9234 if (flags != DTOR_FLAG)
9236 /* It's a constructor. */
9241 permerror (input_location, "constructors cannot be declared virtual");
9244 if (decl_context == FIELD
9245 && sfk != sfk_constructor)
9246 return error_mark_node;
9248 if (decl_context == FIELD)
9254 error ("can%'t initialize friend function %qs", name);
9257 /* Cannot be both friend and virtual. */
9258 error ("virtual functions cannot be friends");
9261 if (decl_context == NORMAL)
9262 error ("friend declaration not in class definition");
9263 if (current_function_decl && funcdef_flag)
9264 error ("can%'t define friend function %qs in a local "
9268 else if (ctype && sfk == sfk_conversion)
9272 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9277 arg_types = grokparms (declarator->u.function.parameters,
9280 if (inner_declarator
9281 && inner_declarator->kind == cdk_id
9282 && inner_declarator->u.id.sfk == sfk_destructor
9283 && arg_types != void_list_node)
9285 error ("destructors may not have parameters");
9286 arg_types = void_list_node;
9290 type = build_function_type (type, arg_types);
9297 /* Filter out pointers-to-references and references-to-references.
9298 We can get these if a TYPE_DECL is used. */
9300 if (TREE_CODE (type) == REFERENCE_TYPE)
9302 if (declarator->kind != cdk_reference)
9304 error ("cannot declare pointer to %q#T", type);
9305 type = TREE_TYPE (type);
9308 /* In C++0x, we allow reference to reference declarations
9309 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9310 and template type arguments [14.3.1/4 temp.arg.type]. The
9311 check for direct reference to reference declarations, which
9312 are still forbidden, occurs below. Reasoning behind the change
9313 can be found in DR106, DR540, and the rvalue reference
9315 else if (cxx_dialect == cxx98)
9317 error ("cannot declare reference to %q#T", type);
9318 type = TREE_TYPE (type);
9321 else if (VOID_TYPE_P (type))
9323 if (declarator->kind == cdk_reference)
9324 error ("cannot declare reference to %q#T", type);
9325 else if (declarator->kind == cdk_ptrmem)
9326 error ("cannot declare pointer to %q#T member", type);
9329 /* We now know that the TYPE_QUALS don't apply to the decl,
9330 but to the target of the pointer. */
9331 type_quals = TYPE_UNQUALIFIED;
9333 if (declarator->kind == cdk_ptrmem
9334 && (TREE_CODE (type) == FUNCTION_TYPE
9335 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9337 memfn_quals |= type_memfn_quals (type);
9338 type = build_memfn_type (type,
9339 declarator->u.pointer.class_type,
9341 if (type == error_mark_node)
9342 return error_mark_node;
9343 memfn_quals = TYPE_UNQUALIFIED;
9346 if (TREE_CODE (type) == FUNCTION_TYPE
9347 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9348 error (declarator->kind == cdk_reference
9349 ? G_("cannot declare reference to qualified function type %qT")
9350 : G_("cannot declare pointer to qualified function type %qT"),
9353 /* When the pointed-to type involves components of variable size,
9354 care must be taken to ensure that the size evaluation code is
9355 emitted early enough to dominate all the possible later uses
9356 and late enough for the variables on which it depends to have
9359 This is expected to happen automatically when the pointed-to
9360 type has a name/declaration of it's own, but special attention
9361 is required if the type is anonymous.
9363 We handle the NORMAL and FIELD contexts here by inserting a
9364 dummy statement that just evaluates the size at a safe point
9365 and ensures it is not deferred until e.g. within a deeper
9366 conditional context (c++/43555).
9368 We expect nothing to be needed here for PARM or TYPENAME.
9369 Evaluating the size at this point for TYPENAME would
9370 actually be incorrect, as we might be in the middle of an
9371 expression with side effects on the pointed-to type size
9372 "arguments" prior to the pointer declaration point and the
9373 size evaluation could end up prior to the side effects. */
9375 if (!TYPE_NAME (type)
9376 && (decl_context == NORMAL || decl_context == FIELD)
9377 && at_function_scope_p ()
9378 && variably_modified_type_p (type, NULL_TREE))
9380 /* First break out any side-effects. */
9381 stabilize_vla_size (TYPE_SIZE (type));
9382 /* And then force evaluation of the SAVE_EXPR. */
9383 finish_expr_stmt (TYPE_SIZE (type));
9386 if (declarator->kind == cdk_reference)
9388 /* In C++0x, the type we are creating a reference to might be
9389 a typedef which is itself a reference type. In that case,
9390 we follow the reference collapsing rules in
9391 [7.1.3/8 dcl.typedef] to create the final reference type:
9393 "If a typedef TD names a type that is a reference to a type
9394 T, an attempt to create the type 'lvalue reference to cv TD'
9395 creates the type 'lvalue reference to T,' while an attempt
9396 to create the type "rvalue reference to cv TD' creates the
9399 if (VOID_TYPE_P (type))
9400 /* We already gave an error. */;
9401 else if (TREE_CODE (type) == REFERENCE_TYPE)
9403 if (declarator->u.reference.rvalue_ref)
9404 /* Leave type alone. */;
9406 type = cp_build_reference_type (TREE_TYPE (type), false);
9409 type = cp_build_reference_type
9410 (type, declarator->u.reference.rvalue_ref);
9412 /* In C++0x, we need this check for direct reference to
9413 reference declarations, which are forbidden by
9414 [8.3.2/5 dcl.ref]. Reference to reference declarations
9415 are only allowed indirectly through typedefs and template
9416 type arguments. Example:
9418 void foo(int & &); // invalid ref-to-ref decl
9420 typedef int & int_ref;
9421 void foo(int_ref &); // valid ref-to-ref decl
9423 if (inner_declarator && inner_declarator->kind == cdk_reference)
9424 error ("cannot declare reference to %q#T, which is not "
9425 "a typedef or a template type argument", type);
9427 else if (TREE_CODE (type) == METHOD_TYPE)
9428 type = build_ptrmemfunc_type (build_pointer_type (type));
9429 else if (declarator->kind == cdk_ptrmem)
9431 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9433 if (declarator->u.pointer.class_type == error_mark_node)
9434 /* We will already have complained. */
9435 type = error_mark_node;
9437 type = build_ptrmem_type (declarator->u.pointer.class_type,
9441 type = build_pointer_type (type);
9443 /* Process a list of type modifier keywords (such as
9444 const or volatile) that were given inside the `*' or `&'. */
9446 if (declarator->u.pointer.qualifiers)
9449 = cp_build_qualified_type (type,
9450 declarator->u.pointer.qualifiers);
9451 type_quals = cp_type_quals (type);
9464 /* We need to stabilize side-effects in VLA sizes for regular array
9465 declarations too, not just pointers to arrays. */
9466 if (type != error_mark_node && !TYPE_NAME (type)
9467 && (decl_context == NORMAL || decl_context == FIELD)
9468 && at_function_scope_p ()
9469 && variably_modified_type_p (type, NULL_TREE))
9470 stabilize_vla_size (TYPE_SIZE (type));
9472 /* A `constexpr' specifier used in an object declaration declares
9473 the object as `const'. */
9474 if (constexpr_p && innermost_code != cdk_function)
9476 if (type_quals & TYPE_QUAL_CONST)
9477 error ("both %<const%> and %<constexpr%> cannot be used here");
9478 if (type_quals & TYPE_QUAL_VOLATILE)
9479 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9480 if (TREE_CODE (type) != REFERENCE_TYPE)
9482 type_quals |= TYPE_QUAL_CONST;
9483 type = cp_build_qualified_type (type, type_quals);
9487 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9488 && TREE_CODE (type) != FUNCTION_TYPE
9489 && TREE_CODE (type) != METHOD_TYPE)
9491 error ("template-id %qD used as a declarator",
9493 unqualified_id = dname;
9496 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9497 qualified with a class-name, turn it into a METHOD_TYPE, unless
9498 we know that the function is static. We take advantage of this
9499 opportunity to do other processing that pertains to entities
9500 explicitly declared to be class members. Note that if DECLARATOR
9501 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9502 would not have exited the loop above. */
9504 && declarator->u.id.qualifying_scope
9505 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9509 ctype = declarator->u.id.qualifying_scope;
9510 ctype = TYPE_MAIN_VARIANT (ctype);
9512 while (t != NULL_TREE && CLASS_TYPE_P (t))
9514 /* You're supposed to have one `template <...>' for every
9515 template class, but you don't need one for a full
9516 specialization. For example:
9518 template <class T> struct S{};
9519 template <> struct S<int> { void f(); };
9520 void S<int>::f () {}
9522 is correct; there shouldn't be a `template <>' for the
9523 definition of `S<int>::f'. */
9524 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9525 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9526 /* T is an explicit (not partial) specialization. All
9527 containing classes must therefore also be explicitly
9530 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9531 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9532 template_count += 1;
9534 t = TYPE_MAIN_DECL (t);
9535 t = DECL_CONTEXT (t);
9538 if (ctype == current_class_type)
9542 permerror (input_location, "member functions are implicitly friends of their class");
9546 permerror (declarator->id_loc,
9547 "extra qualification %<%T::%> on member %qs",
9550 else if (/* If the qualifying type is already complete, then we
9551 can skip the following checks. */
9552 !COMPLETE_TYPE_P (ctype)
9553 && (/* If the function is being defined, then
9554 qualifying type must certainly be complete. */
9556 /* A friend declaration of "T::f" is OK, even if
9557 "T" is a template parameter. But, if this
9558 function is not a friend, the qualifying type
9560 || (!friendp && !CLASS_TYPE_P (ctype))
9561 /* For a declaration, the type need not be
9562 complete, if either it is dependent (since there
9563 is no meaningful definition of complete in that
9564 case) or the qualifying class is currently being
9566 || !(dependent_type_p (ctype)
9567 || currently_open_class (ctype)))
9568 /* Check that the qualifying type is complete. */
9569 && !complete_type_or_else (ctype, NULL_TREE))
9570 return error_mark_node;
9571 else if (TREE_CODE (type) == FUNCTION_TYPE)
9573 if (current_class_type
9574 && (!friendp || funcdef_flag))
9577 ? G_("cannot define member function %<%T::%s%> "
9579 : G_("cannot declare member function %<%T::%s%> "
9581 ctype, name, current_class_type);
9582 return error_mark_node;
9585 else if (declspecs->specs[(int)ds_typedef]
9586 && current_class_type)
9588 error ("cannot declare member %<%T::%s%> within %qT",
9589 ctype, name, current_class_type);
9590 return error_mark_node;
9594 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9595 ctype = current_class_type;
9597 /* Now TYPE has the actual type. */
9602 *attrlist = chainon (returned_attrs, *attrlist);
9604 attrlist = &returned_attrs;
9607 /* Handle parameter packs. */
9608 if (parameter_pack_p)
9610 if (decl_context == PARM)
9611 /* Turn the type into a pack expansion.*/
9612 type = make_pack_expansion (type);
9614 error ("non-parameter %qs cannot be a parameter pack", name);
9617 /* Did array size calculations overflow? */
9619 if (TREE_CODE (type) == ARRAY_TYPE
9620 && COMPLETE_TYPE_P (type)
9621 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9622 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9624 error ("size of array %qs is too large", name);
9625 /* If we proceed with the array type as it is, we'll eventually
9626 crash in tree_low_cst(). */
9627 type = error_mark_node;
9630 if ((decl_context == FIELD || decl_context == PARM)
9631 && !processing_template_decl
9632 && variably_modified_type_p (type, NULL_TREE))
9634 if (decl_context == FIELD)
9635 error ("data member may not have variably modified type %qT", type);
9637 error ("parameter may not have variably modified type %qT", type);
9638 type = error_mark_node;
9641 if (explicitp == 1 || (explicitp && friendp))
9643 /* [dcl.fct.spec] The explicit specifier shall only be used in
9644 declarations of constructors within a class definition. */
9645 error ("only declarations of constructors can be %<explicit%>");
9649 if (storage_class == sc_mutable)
9651 if (decl_context != FIELD || friendp)
9653 error ("non-member %qs cannot be declared %<mutable%>", name);
9654 storage_class = sc_none;
9656 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9658 error ("non-object member %qs cannot be declared %<mutable%>", name);
9659 storage_class = sc_none;
9661 else if (TREE_CODE (type) == FUNCTION_TYPE
9662 || TREE_CODE (type) == METHOD_TYPE)
9664 error ("function %qs cannot be declared %<mutable%>", name);
9665 storage_class = sc_none;
9669 error ("static %qs cannot be declared %<mutable%>", name);
9670 storage_class = sc_none;
9672 else if (type_quals & TYPE_QUAL_CONST)
9674 error ("const %qs cannot be declared %<mutable%>", name);
9675 storage_class = sc_none;
9677 else if (TREE_CODE (type) == REFERENCE_TYPE)
9679 permerror (input_location, "reference %qs cannot be declared "
9680 "%<mutable%>", name);
9681 storage_class = sc_none;
9685 /* If this is declaring a typedef name, return a TYPE_DECL. */
9686 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9690 /* Note that the grammar rejects storage classes
9691 in typenames, fields or parameters. */
9692 if (current_lang_name == lang_name_java)
9693 TYPE_FOR_JAVA (type) = 1;
9695 /* This declaration:
9697 typedef void f(int) const;
9699 declares a function type which is not a member of any
9700 particular class, but which is cv-qualified; for
9701 example "f S::*" declares a pointer to a const-qualified
9702 member function of S. We record the cv-qualification in the
9704 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9706 type = apply_memfn_quals (type, memfn_quals);
9708 /* We have now dealt with these qualifiers. */
9709 memfn_quals = TYPE_UNQUALIFIED;
9712 if (type_uses_auto (type))
9714 error ("typedef declared %<auto%>");
9715 type = error_mark_node;
9718 if (decl_context == FIELD)
9719 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9721 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9722 if (id_declarator && declarator->u.id.qualifying_scope) {
9723 error_at (DECL_SOURCE_LOCATION (decl),
9724 "typedef name may not be a nested-name-specifier");
9725 TREE_TYPE (decl) = error_mark_node;
9728 if (decl_context != FIELD)
9730 if (!current_function_decl)
9731 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9732 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9733 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9734 (current_function_decl)))
9735 /* The TYPE_DECL is "abstract" because there will be
9736 clones of this constructor/destructor, and there will
9737 be copies of this TYPE_DECL generated in those
9739 DECL_ABSTRACT (decl) = 1;
9741 else if (constructor_name_p (unqualified_id, current_class_type))
9742 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9743 "as enclosing class",
9746 /* If the user declares "typedef struct {...} foo" then the
9747 struct will have an anonymous name. Fill that name in now.
9748 Nothing can refer to it, so nothing needs know about the name
9750 if (type != error_mark_node
9753 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9754 && TYPE_ANONYMOUS_P (type)
9755 && declspecs->type_definition_p
9756 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9760 /* Replace the anonymous name with the real name everywhere. */
9761 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9763 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9764 /* We do not rename the debug info representing the
9765 anonymous tagged type because the standard says in
9766 [dcl.typedef] that the naming applies only for
9767 linkage purposes. */
9768 /*debug_hooks->set_name (t, decl);*/
9769 TYPE_NAME (t) = decl;
9772 if (TYPE_LANG_SPECIFIC (type))
9773 TYPE_WAS_ANONYMOUS (type) = 1;
9775 /* If this is a typedef within a template class, the nested
9776 type is a (non-primary) template. The name for the
9777 template needs updating as well. */
9778 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9779 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9780 = TYPE_IDENTIFIER (type);
9782 /* Adjust linkage now that we aren't anonymous anymore. */
9783 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9784 determine_visibility (TYPE_MAIN_DECL (type));
9786 /* FIXME remangle member functions; member functions of a
9787 type with external linkage have external linkage. */
9791 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9792 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9794 bad_specifiers (decl, BSP_TYPE, virtualp,
9795 memfn_quals != TYPE_UNQUALIFIED,
9796 inlinep, friendp, raises != NULL_TREE);
9798 if (declspecs->specs[(int)ds_alias])
9799 /* Acknowledge that this was written:
9800 `using analias = atype;'. */
9801 TYPE_DECL_ALIAS_P (decl) = 1;
9806 /* Detect the case of an array type of unspecified size
9807 which came, as such, direct from a typedef name.
9808 We must copy the type, so that the array's domain can be
9809 individually set by the object's initializer. */
9811 if (type && typedef_type
9812 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9813 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9814 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9816 /* Detect where we're using a typedef of function type to declare a
9817 function. PARMS will not be set, so we must create it now. */
9819 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9821 tree decls = NULL_TREE;
9824 for (args = TYPE_ARG_TYPES (type);
9825 args && args != void_list_node;
9826 args = TREE_CHAIN (args))
9828 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9830 DECL_CHAIN (decl) = decls;
9834 parms = nreverse (decls);
9836 if (decl_context != TYPENAME)
9838 /* A cv-qualifier-seq shall only be part of the function type
9839 for a non-static member function. [8.3.5/4 dcl.fct] */
9840 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9841 && (current_class_type == NULL_TREE || staticp) )
9844 ? G_("qualified function types cannot be used to "
9845 "declare static member functions")
9846 : G_("qualified function types cannot be used to "
9847 "declare free functions"));
9848 type = TYPE_MAIN_VARIANT (type);
9851 /* The qualifiers on the function type become the qualifiers on
9852 the non-static member function. */
9853 memfn_quals |= type_memfn_quals (type);
9854 type_quals = TYPE_UNQUALIFIED;
9858 /* If this is a type name (such as, in a cast or sizeof),
9859 compute the type and return it now. */
9861 if (decl_context == TYPENAME)
9863 /* Note that the grammar rejects storage classes
9864 in typenames, fields or parameters. */
9865 if (type_quals != TYPE_UNQUALIFIED)
9866 type_quals = TYPE_UNQUALIFIED;
9868 /* Special case: "friend class foo" looks like a TYPENAME context. */
9871 if (type_quals != TYPE_UNQUALIFIED)
9873 error ("type qualifiers specified for friend class declaration");
9874 type_quals = TYPE_UNQUALIFIED;
9878 error ("%<inline%> specified for friend class declaration");
9884 /* Don't allow friend declaration without a class-key. */
9885 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9886 permerror (input_location, "template parameters cannot be friends");
9887 else if (TREE_CODE (type) == TYPENAME_TYPE)
9888 permerror (input_location, "friend declaration requires class-key, "
9889 "i.e. %<friend class %T::%D%>",
9890 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9892 permerror (input_location, "friend declaration requires class-key, "
9893 "i.e. %<friend %#T%>",
9897 /* Only try to do this stuff if we didn't already give up. */
9898 if (type != integer_type_node)
9900 /* A friendly class? */
9901 if (current_class_type)
9902 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9905 error ("trying to make class %qT a friend of global scope",
9908 type = void_type_node;
9911 else if (memfn_quals)
9913 if (ctype == NULL_TREE
9914 && TREE_CODE (type) == METHOD_TYPE)
9915 ctype = TYPE_METHOD_BASETYPE (type);
9918 type = build_memfn_type (type, ctype, memfn_quals);
9919 /* Core issue #547: need to allow this in template type args. */
9920 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9921 type = apply_memfn_quals (type, memfn_quals);
9923 error ("invalid qualifiers on non-member function type");
9928 else if (unqualified_id == NULL_TREE && decl_context != PARM
9929 && decl_context != CATCHPARM
9930 && TREE_CODE (type) != UNION_TYPE
9933 error ("abstract declarator %qT used as declaration", type);
9934 return error_mark_node;
9937 /* Only functions may be declared using an operator-function-id. */
9939 && IDENTIFIER_OPNAME_P (unqualified_id)
9940 && TREE_CODE (type) != FUNCTION_TYPE
9941 && TREE_CODE (type) != METHOD_TYPE)
9943 error ("declaration of %qD as non-function", unqualified_id);
9944 return error_mark_node;
9947 /* We don't check parameter types here because we can emit a better
9948 error message later. */
9949 if (decl_context != PARM)
9951 type = check_var_type (unqualified_id, type);
9952 if (type == error_mark_node)
9953 return error_mark_node;
9956 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9957 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9959 if (decl_context == PARM || decl_context == CATCHPARM)
9961 if (ctype || in_namespace)
9962 error ("cannot use %<::%> in parameter declaration");
9964 if (type_uses_auto (type))
9966 error ("parameter declared %<auto%>");
9967 type = error_mark_node;
9970 /* A parameter declared as an array of T is really a pointer to T.
9971 One declared as a function is really a pointer to a function.
9972 One declared as a member is really a pointer to member. */
9974 if (TREE_CODE (type) == ARRAY_TYPE)
9976 /* Transfer const-ness of array into that of type pointed to. */
9977 type = build_pointer_type (TREE_TYPE (type));
9978 type_quals = TYPE_UNQUALIFIED;
9980 else if (TREE_CODE (type) == FUNCTION_TYPE)
9981 type = build_pointer_type (type);
9984 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9985 && !NEW_DELETE_OPNAME_P (unqualified_id))
9987 cp_cv_quals real_quals = memfn_quals;
9988 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9989 real_quals |= TYPE_QUAL_CONST;
9990 type = build_memfn_type (type, ctype, real_quals);
9996 if (decl_context == PARM)
9998 decl = cp_build_parm_decl (unqualified_id, type);
10000 bad_specifiers (decl, BSP_PARM, virtualp,
10001 memfn_quals != TYPE_UNQUALIFIED,
10002 inlinep, friendp, raises != NULL_TREE);
10004 else if (decl_context == FIELD)
10006 if (!staticp && type_uses_auto (type))
10008 error ("non-static data member declared %<auto%>");
10009 type = error_mark_node;
10012 /* The C99 flexible array extension. */
10013 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10014 && TYPE_DOMAIN (type) == NULL_TREE)
10016 tree itype = compute_array_index_type (dname, integer_zero_node,
10017 tf_warning_or_error);
10018 type = build_cplus_array_type (TREE_TYPE (type), itype);
10021 if (type == error_mark_node)
10023 /* Happens when declaring arrays of sizes which
10024 are error_mark_node, for example. */
10027 else if (in_namespace && !friendp)
10029 /* Something like struct S { int N::j; }; */
10030 error ("invalid use of %<::%>");
10031 return error_mark_node;
10033 else if (TREE_CODE (type) == FUNCTION_TYPE
10034 || TREE_CODE (type) == METHOD_TYPE)
10037 tree function_context;
10041 /* This should never happen in pure C++ (the check
10042 could be an assert). It could happen in
10043 Objective-C++ if someone writes invalid code that
10044 uses a function declaration for an instance
10045 variable or property (instance variables and
10046 properties are parsed as FIELD_DECLs, but they are
10047 part of an Objective-C class, not a C++ class).
10048 That code is invalid and is caught by this
10052 error ("declaration of function %qD in invalid context",
10054 return error_mark_node;
10057 /* ``A union may [ ... ] not [ have ] virtual functions.''
10059 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10061 error ("function %qD declared virtual inside a union",
10063 return error_mark_node;
10066 if (NEW_DELETE_OPNAME_P (unqualified_id))
10070 error ("%qD cannot be declared virtual, since it "
10071 "is always static",
10078 /* Check that the name used for a destructor makes sense. */
10079 if (sfk == sfk_destructor)
10081 tree uqname = id_declarator->u.id.unqualified_name;
10085 gcc_assert (friendp);
10086 error ("expected qualified name in friend declaration "
10087 "for destructor %qD", uqname);
10088 return error_mark_node;
10091 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10093 error ("declaration of %qD as member of %qT",
10095 return error_mark_node;
10099 error ("a destructor cannot be %<constexpr%>");
10100 return error_mark_node;
10103 else if (sfk == sfk_constructor && friendp && !ctype)
10105 error ("expected qualified name in friend declaration "
10106 "for constructor %qD",
10107 id_declarator->u.id.unqualified_name);
10108 return error_mark_node;
10111 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10112 function_context = (ctype != NULL_TREE) ?
10113 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10114 publicp = (! friendp || ! staticp)
10115 && function_context == NULL_TREE;
10116 decl = grokfndecl (ctype, type,
10117 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10118 ? unqualified_id : dname,
10121 virtualp, flags, memfn_quals, raises,
10122 friendp ? -1 : 0, friendp, publicp,
10123 inlinep | (2 * constexpr_p),
10125 funcdef_flag, template_count, in_namespace,
10126 attrlist, declarator->id_loc);
10127 decl = set_virt_specifiers (decl, virt_specifiers);
10128 if (decl == NULL_TREE)
10129 return error_mark_node;
10131 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10132 /* The decl and setting of decl_attr is also turned off. */
10133 decl = build_decl_attribute_variant (decl, decl_attr);
10136 /* [class.conv.ctor]
10138 A constructor declared without the function-specifier
10139 explicit that can be called with a single parameter
10140 specifies a conversion from the type of its first
10141 parameter to the type of its class. Such a constructor
10142 is called a converting constructor. */
10143 if (explicitp == 2)
10144 DECL_NONCONVERTING_P (decl) = 1;
10146 else if (!staticp && !dependent_type_p (type)
10147 && !COMPLETE_TYPE_P (complete_type (type))
10148 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10150 if (unqualified_id)
10151 error ("field %qD has incomplete type", unqualified_id);
10153 error ("name %qT has incomplete type", type);
10155 /* If we're instantiating a template, tell them which
10156 instantiation made the field's type be incomplete. */
10157 if (current_class_type
10158 && TYPE_NAME (current_class_type)
10159 && IDENTIFIER_TEMPLATE (current_class_name)
10161 && declspecs->type == type)
10162 error (" in instantiation of template %qT",
10163 current_class_type);
10165 return error_mark_node;
10171 error ("%qE is neither function nor member function; "
10172 "cannot be declared friend", unqualified_id);
10180 /* Friends are treated specially. */
10181 if (ctype == current_class_type)
10182 ; /* We already issued a permerror. */
10183 else if (decl && DECL_NAME (decl))
10185 if (template_class_depth (current_class_type) == 0)
10187 decl = check_explicit_specialization
10188 (unqualified_id, decl, template_count,
10189 2 * funcdef_flag + 4);
10190 if (decl == error_mark_node)
10191 return error_mark_node;
10194 decl = do_friend (ctype, unqualified_id, decl,
10200 return error_mark_node;
10203 /* Structure field. It may not be a function, except for C++. */
10205 if (decl == NULL_TREE)
10209 /* C++ allows static class members. All other work
10210 for this is done by grokfield. */
10211 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10212 set_linkage_for_static_data_member (decl);
10213 /* Even if there is an in-class initialization, DECL
10214 is considered undefined until an out-of-class
10215 definition is provided. */
10216 DECL_EXTERNAL (decl) = 1;
10219 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10221 if (constexpr_p && !initialized)
10223 error ("constexpr static data member %qD must have an "
10224 "initializer", decl);
10225 constexpr_p = false;
10232 error ("non-static data member %qE declared %<constexpr%>",
10234 constexpr_p = false;
10236 decl = build_decl (input_location,
10237 FIELD_DECL, unqualified_id, type);
10238 DECL_NONADDRESSABLE_P (decl) = bitfield;
10239 if (bitfield && !unqualified_id)
10240 TREE_NO_WARNING (decl) = 1;
10242 if (storage_class == sc_mutable)
10244 DECL_MUTABLE_P (decl) = 1;
10245 storage_class = sc_none;
10250 /* An attempt is being made to initialize a non-static
10251 member. This is new in C++11. */
10252 maybe_warn_cpp0x (CPP0X_NSDMI);
10254 /* If this has been parsed with static storage class, but
10255 errors forced staticp to be cleared, ensure NSDMI is
10257 if (declspecs->storage_class == sc_static)
10258 DECL_INITIAL (decl) = error_mark_node;
10262 bad_specifiers (decl, BSP_FIELD, virtualp,
10263 memfn_quals != TYPE_UNQUALIFIED,
10264 inlinep, friendp, raises != NULL_TREE);
10267 else if (TREE_CODE (type) == FUNCTION_TYPE
10268 || TREE_CODE (type) == METHOD_TYPE)
10270 tree original_name;
10273 if (!unqualified_id)
10274 return error_mark_node;
10276 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10277 original_name = dname;
10279 original_name = unqualified_id;
10281 if (storage_class == sc_auto)
10282 error ("storage class %<auto%> invalid for function %qs", name);
10283 else if (storage_class == sc_register)
10284 error ("storage class %<register%> invalid for function %qs", name);
10286 error ("storage class %<__thread%> invalid for function %qs", name);
10288 if (virt_specifiers)
10289 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10290 /* Function declaration not at top level.
10291 Storage classes other than `extern' are not allowed
10292 and `extern' makes no difference. */
10293 if (! toplevel_bindings_p ()
10294 && (storage_class == sc_static
10295 || declspecs->specs[(int)ds_inline])
10298 if (storage_class == sc_static)
10299 pedwarn (input_location, OPT_pedantic,
10300 "%<static%> specified invalid for function %qs "
10301 "declared out of global scope", name);
10303 pedwarn (input_location, OPT_pedantic,
10304 "%<inline%> specifier invalid for function %qs "
10305 "declared out of global scope", name);
10308 if (ctype == NULL_TREE)
10312 error ("virtual non-class function %qs", name);
10315 else if (sfk == sfk_constructor
10316 || sfk == sfk_destructor)
10318 error (funcdef_flag
10319 ? G_("%qs defined in a non-class scope")
10320 : G_("%qs declared in a non-class scope"), name);
10325 /* Record presence of `static'. */
10326 publicp = (ctype != NULL_TREE
10327 || storage_class == sc_extern
10328 || storage_class != sc_static);
10330 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10331 virtualp, flags, memfn_quals, raises,
10333 publicp, inlinep | (2 * constexpr_p), sfk,
10335 template_count, in_namespace, attrlist,
10336 declarator->id_loc);
10337 if (decl == NULL_TREE)
10338 return error_mark_node;
10342 int invalid_static = 0;
10344 /* Don't allow a static member function in a class, and forbid
10345 declaring main to be static. */
10346 if (TREE_CODE (type) == METHOD_TYPE)
10348 permerror (input_location, "cannot declare member function %qD to have "
10349 "static linkage", decl);
10350 invalid_static = 1;
10352 else if (current_function_decl)
10354 /* FIXME need arm citation */
10355 error ("cannot declare static function inside another function");
10356 invalid_static = 1;
10359 if (invalid_static)
10362 storage_class = sc_none;
10368 /* It's a variable. */
10370 /* An uninitialized decl with `extern' is a reference. */
10371 decl = grokvardecl (type, unqualified_id,
10374 (type_quals & TYPE_QUAL_CONST) != 0,
10375 ctype ? ctype : in_namespace);
10376 bad_specifiers (decl, BSP_VAR, virtualp,
10377 memfn_quals != TYPE_UNQUALIFIED,
10378 inlinep, friendp, raises != NULL_TREE);
10382 DECL_CONTEXT (decl) = ctype;
10385 permerror (input_location, "%<static%> may not be used when defining "
10386 "(as opposed to declaring) a static data member");
10388 storage_class = sc_none;
10390 if (storage_class == sc_register && TREE_STATIC (decl))
10392 error ("static member %qD declared %<register%>", decl);
10393 storage_class = sc_none;
10395 if (storage_class == sc_extern && pedantic)
10397 pedwarn (input_location, OPT_pedantic,
10398 "cannot explicitly declare member %q#D to have "
10399 "extern linkage", decl);
10400 storage_class = sc_none;
10403 else if (constexpr_p && DECL_EXTERNAL (decl))
10405 error ("declaration of constexpr variable %qD is not a definition",
10407 constexpr_p = false;
10411 if (storage_class == sc_extern && initialized && !funcdef_flag)
10413 if (toplevel_bindings_p ())
10415 /* It's common practice (and completely valid) to have a const
10416 be initialized and declared extern. */
10417 if (!(type_quals & TYPE_QUAL_CONST))
10418 warning (0, "%qs initialized and declared %<extern%>", name);
10422 error ("%qs has both %<extern%> and initializer", name);
10423 return error_mark_node;
10427 /* Record `register' declaration for warnings on &
10428 and in case doing stupid register allocation. */
10430 if (storage_class == sc_register)
10431 DECL_REGISTER (decl) = 1;
10432 else if (storage_class == sc_extern)
10433 DECL_THIS_EXTERN (decl) = 1;
10434 else if (storage_class == sc_static)
10435 DECL_THIS_STATIC (decl) = 1;
10437 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10438 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10439 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10441 /* Record constancy and volatility on the DECL itself . There's
10442 no need to do this when processing a template; we'll do this
10443 for the instantiated declaration based on the type of DECL. */
10444 if (!processing_template_decl)
10445 cp_apply_type_quals_to_decl (type_quals, decl);
10451 /* Subroutine of start_function. Ensure that each of the parameter
10452 types (as listed in PARMS) is complete, as is required for a
10453 function definition. */
10456 require_complete_types_for_parms (tree parms)
10458 for (; parms; parms = DECL_CHAIN (parms))
10460 if (dependent_type_p (TREE_TYPE (parms)))
10462 if (!VOID_TYPE_P (TREE_TYPE (parms))
10463 && complete_type_or_else (TREE_TYPE (parms), parms))
10465 relayout_decl (parms);
10466 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10469 /* grokparms or complete_type_or_else will have already issued
10471 TREE_TYPE (parms) = error_mark_node;
10475 /* Returns nonzero if T is a local variable. */
10478 local_variable_p (const_tree t)
10480 if ((TREE_CODE (t) == VAR_DECL
10481 /* A VAR_DECL with a context that is a _TYPE is a static data
10483 && !TYPE_P (CP_DECL_CONTEXT (t))
10484 /* Any other non-local variable must be at namespace scope. */
10485 && !DECL_NAMESPACE_SCOPE_P (t))
10486 || (TREE_CODE (t) == PARM_DECL))
10492 /* Like local_variable_p, but suitable for use as a tree-walking
10496 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10497 void *data ATTRIBUTE_UNUSED)
10499 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10501 else if (TYPE_P (*tp))
10502 *walk_subtrees = 0;
10508 /* Check that ARG, which is a default-argument expression for a
10509 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10510 something goes wrong. DECL may also be a _TYPE node, rather than a
10511 DECL, if there is no DECL available. */
10514 check_default_argument (tree decl, tree arg)
10519 if (TREE_CODE (arg) == DEFAULT_ARG)
10520 /* We get a DEFAULT_ARG when looking at an in-class declaration
10521 with a default argument. Ignore the argument for now; we'll
10522 deal with it after the class is complete. */
10531 decl_type = TREE_TYPE (decl);
10533 if (arg == error_mark_node
10534 || decl == error_mark_node
10535 || TREE_TYPE (arg) == error_mark_node
10536 || decl_type == error_mark_node)
10537 /* Something already went wrong. There's no need to check
10539 return error_mark_node;
10541 /* [dcl.fct.default]
10543 A default argument expression is implicitly converted to the
10545 if (!TREE_TYPE (arg)
10546 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10549 error ("default argument for %q#D has type %qT",
10550 decl, TREE_TYPE (arg));
10552 error ("default argument for parameter of type %qT has type %qT",
10553 decl_type, TREE_TYPE (arg));
10555 return error_mark_node;
10558 /* [dcl.fct.default]
10560 Local variables shall not be used in default argument
10563 The keyword `this' shall not be used in a default argument of a
10564 member function. */
10565 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10568 error ("default argument %qE uses local variable %qD", arg, var);
10569 return error_mark_node;
10576 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10579 type_is_deprecated (tree type)
10581 enum tree_code code;
10582 if (TREE_DEPRECATED (type))
10584 if (TYPE_NAME (type)
10585 && TREE_DEPRECATED (TYPE_NAME (type)))
10588 /* Do warn about using typedefs to a deprecated class. */
10589 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10590 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10592 code = TREE_CODE (type);
10594 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10595 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10596 || code == METHOD_TYPE || code == ARRAY_TYPE)
10597 return type_is_deprecated (TREE_TYPE (type));
10599 if (TYPE_PTRMEMFUNC_P (type))
10600 return type_is_deprecated
10601 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10606 /* Decode the list of parameter types for a function type.
10607 Given the list of things declared inside the parens,
10608 return a list of types.
10610 If this parameter does not end with an ellipsis, we append
10613 *PARMS is set to the chain of PARM_DECLs created. */
10616 grokparms (tree parmlist, tree *parms)
10618 tree result = NULL_TREE;
10619 tree decls = NULL_TREE;
10623 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10625 tree type = NULL_TREE;
10626 tree init = TREE_PURPOSE (parm);
10627 tree decl = TREE_VALUE (parm);
10628 const char *errmsg;
10630 if (parm == void_list_node)
10633 if (! decl || TREE_TYPE (decl) == error_mark_node)
10636 type = TREE_TYPE (decl);
10637 if (VOID_TYPE_P (type))
10639 if (same_type_p (type, void_type_node)
10640 && DECL_SELF_REFERENCE_P (type)
10641 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10642 /* this is a parmlist of `(void)', which is ok. */
10644 cxx_incomplete_type_error (decl, type);
10645 /* It's not a good idea to actually create parameters of
10646 type `void'; other parts of the compiler assume that a
10647 void type terminates the parameter list. */
10648 type = error_mark_node;
10649 TREE_TYPE (decl) = error_mark_node;
10652 if (type != error_mark_node
10653 && TYPE_FOR_JAVA (type)
10654 && MAYBE_CLASS_TYPE_P (type))
10656 error ("parameter %qD has Java class type", decl);
10657 type = error_mark_node;
10658 TREE_TYPE (decl) = error_mark_node;
10662 if (type != error_mark_node
10663 && (errmsg = targetm.invalid_parameter_type (type)))
10666 type = error_mark_node;
10667 TREE_TYPE (decl) = error_mark_node;
10670 if (type != error_mark_node)
10672 if (deprecated_state != DEPRECATED_SUPPRESS)
10674 tree deptype = type_is_deprecated (type);
10676 warn_deprecated_use (deptype, NULL_TREE);
10679 /* Top-level qualifiers on the parameters are
10680 ignored for function types. */
10681 type = cp_build_qualified_type (type, 0);
10682 if (TREE_CODE (type) == METHOD_TYPE)
10684 error ("parameter %qD invalidly declared method type", decl);
10685 type = build_pointer_type (type);
10686 TREE_TYPE (decl) = type;
10688 else if (abstract_virtuals_error (decl, type))
10689 any_error = 1; /* Seems like a good idea. */
10690 else if (POINTER_TYPE_P (type))
10692 /* [dcl.fct]/6, parameter types cannot contain pointers
10693 (references) to arrays of unknown bound. */
10694 tree t = TREE_TYPE (type);
10695 int ptr = TYPE_PTR_P (type);
10699 if (TYPE_PTR_P (t))
10701 else if (TREE_CODE (t) != ARRAY_TYPE)
10703 else if (!TYPE_DOMAIN (t))
10707 if (TREE_CODE (t) == ARRAY_TYPE)
10709 ? G_("parameter %qD includes pointer to array of "
10710 "unknown bound %qT")
10711 : G_("parameter %qD includes reference to array of "
10712 "unknown bound %qT"),
10718 else if (init && !processing_template_decl)
10719 init = check_default_argument (decl, init);
10722 DECL_CHAIN (decl) = decls;
10724 result = tree_cons (init, type, result);
10726 decls = nreverse (decls);
10727 result = nreverse (result);
10729 result = chainon (result, void_list_node);
10736 /* D is a constructor or overloaded `operator='.
10738 Let T be the class in which D is declared. Then, this function
10741 -1 if D's is an ill-formed constructor or copy assignment operator
10742 whose first parameter is of type `T'.
10743 0 if D is not a copy constructor or copy assignment
10745 1 if D is a copy constructor or copy assignment operator whose
10746 first parameter is a reference to non-const qualified T.
10747 2 if D is a copy constructor or copy assignment operator whose
10748 first parameter is a reference to const qualified T.
10750 This function can be used as a predicate. Positive values indicate
10751 a copy constructor and nonzero values indicate a copy assignment
10755 copy_fn_p (const_tree d)
10761 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10763 if (TREE_CODE (d) == TEMPLATE_DECL
10764 || (DECL_TEMPLATE_INFO (d)
10765 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10766 /* Instantiations of template member functions are never copy
10767 functions. Note that member functions of templated classes are
10768 represented as template functions internally, and we must
10769 accept those as copy functions. */
10772 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10776 arg_type = TREE_VALUE (args);
10777 if (arg_type == error_mark_node)
10780 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10782 /* Pass by value copy assignment operator. */
10785 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10786 && !TYPE_REF_IS_RVALUE (arg_type)
10787 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10789 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10795 args = TREE_CHAIN (args);
10797 if (args && args != void_list_node && !TREE_PURPOSE (args))
10798 /* There are more non-optional args. */
10804 /* D is a constructor or overloaded `operator='.
10806 Let T be the class in which D is declared. Then, this function
10807 returns true when D is a move constructor or move assignment
10808 operator, false otherwise. */
10811 move_fn_p (const_tree d)
10815 bool result = false;
10817 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10819 if (cxx_dialect == cxx98)
10820 /* There are no move constructors if we are in C++98 mode. */
10823 if (TREE_CODE (d) == TEMPLATE_DECL
10824 || (DECL_TEMPLATE_INFO (d)
10825 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10826 /* Instantiations of template member functions are never copy
10827 functions. Note that member functions of templated classes are
10828 represented as template functions internally, and we must
10829 accept those as copy functions. */
10832 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10836 arg_type = TREE_VALUE (args);
10837 if (arg_type == error_mark_node)
10840 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10841 && TYPE_REF_IS_RVALUE (arg_type)
10842 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10846 args = TREE_CHAIN (args);
10848 if (args && args != void_list_node && !TREE_PURPOSE (args))
10849 /* There are more non-optional args. */
10855 /* Remember any special properties of member function DECL. */
10858 grok_special_member_properties (tree decl)
10862 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10865 class_type = DECL_CONTEXT (decl);
10866 if (DECL_CONSTRUCTOR_P (decl))
10868 int ctor = copy_fn_p (decl);
10870 if (!DECL_ARTIFICIAL (decl))
10871 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10877 A non-template constructor for class X is a copy
10878 constructor if its first parameter is of type X&, const
10879 X&, volatile X& or const volatile X&, and either there
10880 are no other parameters or else all other parameters have
10881 default arguments. */
10882 TYPE_HAS_COPY_CTOR (class_type) = 1;
10883 if (user_provided_p (decl))
10884 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10886 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10888 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10890 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10891 if (user_provided_p (decl))
10892 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10894 else if (move_fn_p (decl) && user_provided_p (decl))
10895 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10896 else if (is_list_ctor (decl))
10897 TYPE_HAS_LIST_CTOR (class_type) = 1;
10899 if (DECL_DECLARED_CONSTEXPR_P (decl)
10900 && !copy_fn_p (decl) && !move_fn_p (decl))
10901 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10903 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10907 A non-template assignment operator for class X is a copy
10908 assignment operator if its parameter is of type X, X&, const
10909 X&, volatile X& or const volatile X&. */
10911 int assop = copy_fn_p (decl);
10915 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10916 if (user_provided_p (decl))
10917 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10919 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10921 else if (move_fn_p (decl) && user_provided_p (decl))
10922 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10924 /* Destructors are handled in check_methods. */
10927 /* Check a constructor DECL has the correct form. Complains
10928 if the class has a constructor of the form X(X). */
10931 grok_ctor_properties (const_tree ctype, const_tree decl)
10933 int ctor_parm = copy_fn_p (decl);
10939 A declaration of a constructor for a class X is ill-formed if
10940 its first parameter is of type (optionally cv-qualified) X
10941 and either there are no other parameters or else all other
10942 parameters have default arguments.
10944 We *don't* complain about member template instantiations that
10945 have this form, though; they can occur as we try to decide
10946 what constructor to use during overload resolution. Since
10947 overload resolution will never prefer such a constructor to
10948 the non-template copy constructor (which is either explicitly
10949 or implicitly defined), there's no need to worry about their
10950 existence. Theoretically, they should never even be
10951 instantiated, but that's hard to forestall. */
10952 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10960 /* An operator with this code is unary, but can also be binary. */
10963 ambi_op_p (enum tree_code code)
10965 return (code == INDIRECT_REF
10966 || code == ADDR_EXPR
10967 || code == UNARY_PLUS_EXPR
10968 || code == NEGATE_EXPR
10969 || code == PREINCREMENT_EXPR
10970 || code == PREDECREMENT_EXPR);
10973 /* An operator with this name can only be unary. */
10976 unary_op_p (enum tree_code code)
10978 return (code == TRUTH_NOT_EXPR
10979 || code == BIT_NOT_EXPR
10980 || code == COMPONENT_REF
10981 || code == TYPE_EXPR);
10984 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10985 errors are issued for invalid declarations. */
10988 grok_op_properties (tree decl, bool complain)
10990 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10992 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10993 tree name = DECL_NAME (decl);
10994 enum tree_code operator_code;
10999 /* Count the number of arguments and check for ellipsis. */
11000 for (argtype = argtypes, arity = 0;
11001 argtype && argtype != void_list_node;
11002 argtype = TREE_CHAIN (argtype))
11004 ellipsis_p = !argtype;
11006 class_type = DECL_CONTEXT (decl);
11007 if (class_type && !CLASS_TYPE_P (class_type))
11008 class_type = NULL_TREE;
11010 if (DECL_CONV_FN_P (decl))
11011 operator_code = TYPE_EXPR;
11015 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11016 if (ansi_opname (CODE) == name) \
11018 operator_code = (CODE); \
11021 else if (ansi_assopname (CODE) == name) \
11023 operator_code = (CODE); \
11024 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11028 #include "operators.def"
11029 #undef DEF_OPERATOR
11031 gcc_unreachable ();
11034 gcc_assert (operator_code != MAX_TREE_CODES);
11035 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11038 switch (operator_code)
11041 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11045 TYPE_GETS_DELETE (class_type) |= 1;
11049 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11052 case VEC_DELETE_EXPR:
11053 TYPE_GETS_DELETE (class_type) |= 2;
11060 /* [basic.std.dynamic.allocation]/1:
11062 A program is ill-formed if an allocation function is declared
11063 in a namespace scope other than global scope or declared static
11066 The same also holds true for deallocation functions. */
11067 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11068 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11070 if (DECL_NAMESPACE_SCOPE_P (decl))
11072 if (CP_DECL_CONTEXT (decl) != global_namespace)
11074 error ("%qD may not be declared within a namespace", decl);
11077 else if (!TREE_PUBLIC (decl))
11079 error ("%qD may not be declared as static", decl);
11085 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11087 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11088 DECL_IS_OPERATOR_NEW (decl) = 1;
11090 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11091 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11094 /* An operator function must either be a non-static member function
11095 or have at least one parameter of a class, a reference to a class,
11096 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11097 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11099 if (operator_code == TYPE_EXPR
11100 || operator_code == CALL_EXPR
11101 || operator_code == COMPONENT_REF
11102 || operator_code == ARRAY_REF
11103 || operator_code == NOP_EXPR)
11105 error ("%qD must be a nonstatic member function", decl);
11112 if (DECL_STATIC_FUNCTION_P (decl))
11114 error ("%qD must be either a non-static member "
11115 "function or a non-member function", decl);
11119 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11121 tree arg = non_reference (TREE_VALUE (p));
11122 if (arg == error_mark_node)
11125 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11126 because these checks are performed even on
11127 template functions. */
11128 if (MAYBE_CLASS_TYPE_P (arg)
11129 || TREE_CODE (arg) == ENUMERAL_TYPE)
11133 if (!p || p == void_list_node)
11136 error ("%qD must have an argument of class or "
11137 "enumerated type", decl);
11143 /* There are no restrictions on the arguments to an overloaded
11145 if (operator_code == CALL_EXPR)
11148 /* Warn about conversion operators that will never be used. */
11149 if (IDENTIFIER_TYPENAME_P (name)
11150 && ! DECL_TEMPLATE_INFO (decl)
11152 /* Warn only declaring the function; there is no need to
11153 warn again about out-of-class definitions. */
11154 && class_type == current_class_type)
11156 tree t = TREE_TYPE (name);
11157 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11160 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11162 if (TREE_CODE (t) == VOID_TYPE)
11163 warning (OPT_Wconversion,
11165 ? G_("conversion to a reference to void "
11166 "will never use a type conversion operator")
11167 : G_("conversion to void "
11168 "will never use a type conversion operator"));
11169 else if (class_type)
11171 if (t == class_type)
11172 warning (OPT_Wconversion,
11174 ? G_("conversion to a reference to the same type "
11175 "will never use a type conversion operator")
11176 : G_("conversion to the same type "
11177 "will never use a type conversion operator"));
11178 /* Don't force t to be complete here. */
11179 else if (MAYBE_CLASS_TYPE_P (t)
11180 && COMPLETE_TYPE_P (t)
11181 && DERIVED_FROM_P (t, class_type))
11182 warning (OPT_Wconversion,
11184 ? G_("conversion to a reference to a base class "
11185 "will never use a type conversion operator")
11186 : G_("conversion to a base class "
11187 "will never use a type conversion operator"));
11192 if (operator_code == COND_EXPR)
11195 error ("ISO C++ prohibits overloading operator ?:");
11198 else if (ellipsis_p)
11200 error ("%qD must not have variable number of arguments", decl);
11203 else if (ambi_op_p (operator_code))
11206 /* We pick the one-argument operator codes by default, so
11207 we don't have to change anything. */
11209 else if (arity == 2)
11211 /* If we thought this was a unary operator, we now know
11212 it to be a binary operator. */
11213 switch (operator_code)
11216 operator_code = MULT_EXPR;
11220 operator_code = BIT_AND_EXPR;
11223 case UNARY_PLUS_EXPR:
11224 operator_code = PLUS_EXPR;
11228 operator_code = MINUS_EXPR;
11231 case PREINCREMENT_EXPR:
11232 operator_code = POSTINCREMENT_EXPR;
11235 case PREDECREMENT_EXPR:
11236 operator_code = POSTDECREMENT_EXPR;
11240 gcc_unreachable ();
11243 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11245 if ((operator_code == POSTINCREMENT_EXPR
11246 || operator_code == POSTDECREMENT_EXPR)
11247 && ! processing_template_decl
11248 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11251 error ("postfix %qD must take %<int%> as its argument",
11254 error ("postfix %qD must take %<int%> as its second "
11262 error ("%qD must take either zero or one argument", decl);
11264 error ("%qD must take either one or two arguments", decl);
11268 /* More Effective C++ rule 6. */
11270 && (operator_code == POSTINCREMENT_EXPR
11271 || operator_code == POSTDECREMENT_EXPR
11272 || operator_code == PREINCREMENT_EXPR
11273 || operator_code == PREDECREMENT_EXPR))
11275 tree arg = TREE_VALUE (argtypes);
11276 tree ret = TREE_TYPE (TREE_TYPE (decl));
11277 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11278 arg = TREE_TYPE (arg);
11279 arg = TYPE_MAIN_VARIANT (arg);
11280 if (operator_code == PREINCREMENT_EXPR
11281 || operator_code == PREDECREMENT_EXPR)
11283 if (TREE_CODE (ret) != REFERENCE_TYPE
11284 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11286 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11287 build_reference_type (arg));
11291 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11292 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11296 else if (unary_op_p (operator_code))
11301 error ("%qD must take %<void%>", decl);
11303 error ("%qD must take exactly one argument", decl);
11307 else /* if (binary_op_p (operator_code)) */
11312 error ("%qD must take exactly one argument", decl);
11314 error ("%qD must take exactly two arguments", decl);
11318 /* More Effective C++ rule 7. */
11320 && (operator_code == TRUTH_ANDIF_EXPR
11321 || operator_code == TRUTH_ORIF_EXPR
11322 || operator_code == COMPOUND_EXPR))
11323 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11327 /* Effective C++ rule 23. */
11330 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11331 && (operator_code == PLUS_EXPR
11332 || operator_code == MINUS_EXPR
11333 || operator_code == TRUNC_DIV_EXPR
11334 || operator_code == MULT_EXPR
11335 || operator_code == TRUNC_MOD_EXPR)
11336 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11337 warning (OPT_Weffc__, "%qD should return by value", decl);
11339 /* [over.oper]/8 */
11340 for (; argtypes && argtypes != void_list_node;
11341 argtypes = TREE_CHAIN (argtypes))
11342 if (TREE_PURPOSE (argtypes))
11344 TREE_PURPOSE (argtypes) = NULL_TREE;
11345 if (operator_code == POSTINCREMENT_EXPR
11346 || operator_code == POSTDECREMENT_EXPR)
11348 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11353 error ("%qD cannot have default arguments", decl);
11361 /* Return a string giving the keyword associate with CODE. */
11363 static const char *
11364 tag_name (enum tag_types code)
11376 case typename_type:
11379 gcc_unreachable ();
11383 /* Name lookup in an elaborated-type-specifier (after the keyword
11384 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11385 elaborated-type-specifier is invalid, issue a diagnostic and return
11386 error_mark_node; otherwise, return the *_TYPE to which it referred.
11387 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11390 check_elaborated_type_specifier (enum tag_types tag_code,
11392 bool allow_template_p)
11396 if (decl == error_mark_node)
11397 return error_mark_node;
11401 struct S { struct S *p; };
11403 name lookup will find the TYPE_DECL for the implicit "S::S"
11404 typedef. Adjust for that here. */
11405 if (DECL_SELF_REFERENCE_P (decl))
11406 decl = TYPE_NAME (TREE_TYPE (decl));
11408 type = TREE_TYPE (decl);
11410 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11411 is false for this case as well. */
11412 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11414 error ("using template type parameter %qT after %qs",
11415 type, tag_name (tag_code));
11416 return error_mark_node;
11418 /* Accept bound template template parameters. */
11419 else if (allow_template_p
11420 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11424 If the identifier resolves to a typedef-name or the
11425 simple-template-id resolves to an alias template
11426 specialization, the elaborated-type-specifier is ill-formed.
11428 In other words, the only legitimate declaration to use in the
11429 elaborated type specifier is the implicit typedef created when
11430 the type is declared. */
11431 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11432 && !DECL_SELF_REFERENCE_P (decl)
11433 && tag_code != typename_type)
11435 if (alias_template_specialization_p (type))
11436 error ("using alias template specialization %qT after %qs",
11437 type, tag_name (tag_code));
11439 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11440 inform (DECL_SOURCE_LOCATION (decl),
11441 "%qD has a previous declaration here", decl);
11442 return error_mark_node;
11444 else if (TREE_CODE (type) != RECORD_TYPE
11445 && TREE_CODE (type) != UNION_TYPE
11446 && tag_code != enum_type
11447 && tag_code != typename_type)
11449 error ("%qT referred to as %qs", type, tag_name (tag_code));
11450 error ("%q+T has a previous declaration here", type);
11451 return error_mark_node;
11453 else if (TREE_CODE (type) != ENUMERAL_TYPE
11454 && tag_code == enum_type)
11456 error ("%qT referred to as enum", type);
11457 error ("%q+T has a previous declaration here", type);
11458 return error_mark_node;
11460 else if (!allow_template_p
11461 && TREE_CODE (type) == RECORD_TYPE
11462 && CLASSTYPE_IS_TEMPLATE (type))
11464 /* If a class template appears as elaborated type specifier
11465 without a template header such as:
11467 template <class T> class C {};
11468 void f(class C); // No template header here
11470 then the required template argument is missing. */
11471 error ("template argument required for %<%s %T%>",
11472 tag_name (tag_code),
11473 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11474 return error_mark_node;
11480 /* Lookup NAME in elaborate type specifier in scope according to
11481 SCOPE and issue diagnostics if necessary.
11482 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11483 found, and ERROR_MARK_NODE for type error. */
11486 lookup_and_check_tag (enum tag_types tag_code, tree name,
11487 tag_scope scope, bool template_header_p)
11491 if (scope == ts_global)
11493 /* First try ordinary name lookup, ignoring hidden class name
11494 injected via friend declaration. */
11495 decl = lookup_name_prefer_type (name, 2);
11496 /* If that fails, the name will be placed in the smallest
11497 non-class, non-function-prototype scope according to 3.3.1/5.
11498 We may already have a hidden name declared as friend in this
11499 scope. So lookup again but not ignoring hidden names.
11500 If we find one, that name will be made visible rather than
11501 creating a new tag. */
11503 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11506 decl = lookup_type_scope (name, scope);
11508 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11509 decl = DECL_TEMPLATE_RESULT (decl);
11511 if (decl && TREE_CODE (decl) == TYPE_DECL)
11513 /* Look for invalid nested type:
11517 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11519 error ("%qD has the same name as the class in which it is "
11522 return error_mark_node;
11525 /* Two cases we need to consider when deciding if a class
11526 template is allowed as an elaborated type specifier:
11527 1. It is a self reference to its own class.
11528 2. It comes with a template header.
11532 template <class T> class C {
11533 class C *c1; // DECL_SELF_REFERENCE_P is true
11536 template <class U> class C; // template_header_p is true
11537 template <class T> class C<T>::D {
11538 class C *c2; // DECL_SELF_REFERENCE_P is true
11541 t = check_elaborated_type_specifier (tag_code,
11544 | DECL_SELF_REFERENCE_P (decl));
11547 else if (decl && TREE_CODE (decl) == TREE_LIST)
11549 error ("reference to %qD is ambiguous", name);
11550 print_candidates (decl);
11551 return error_mark_node;
11557 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11558 Define the tag as a forward-reference if it is not defined.
11560 If a declaration is given, process it here, and report an error if
11561 multiple declarations are not identical.
11563 SCOPE is TS_CURRENT when this is also a definition. Only look in
11564 the current frame for the name (since C++ allows new names in any
11565 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11566 declaration. Only look beginning from the current scope outward up
11567 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11569 TEMPLATE_HEADER_P is true when this declaration is preceded by
11570 a set of template parameters. */
11573 xref_tag_1 (enum tag_types tag_code, tree name,
11574 tag_scope scope, bool template_header_p)
11576 enum tree_code code;
11578 tree context = NULL_TREE;
11580 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11586 code = RECORD_TYPE;
11592 code = ENUMERAL_TYPE;
11595 gcc_unreachable ();
11598 /* In case of anonymous name, xref_tag is only called to
11599 make type node and push name. Name lookup is not required. */
11600 if (ANON_AGGRNAME_P (name))
11603 t = lookup_and_check_tag (tag_code, name,
11604 scope, template_header_p);
11606 if (t == error_mark_node)
11607 return error_mark_node;
11609 if (scope != ts_current && t && current_class_type
11610 && template_class_depth (current_class_type)
11611 && template_header_p)
11613 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11614 definition of this tag. Since, in addition, we are currently
11615 processing a (member) template declaration of a template
11616 class, we must be very careful; consider:
11623 { template <class V>
11624 friend struct S1; };
11626 Here, the S2::S1 declaration should not be confused with the
11627 outer declaration. In particular, the inner version should
11628 have a template parameter of level 2, not level 1. This
11629 would be particularly important if the member declaration
11632 template <class V = U> friend struct S1;
11634 say, when we should tsubst into `U' when instantiating
11635 S2. On the other hand, when presented with:
11645 we must find the inner binding eventually. We
11646 accomplish this by making sure that the new type we
11647 create to represent this declaration has the right
11649 context = TYPE_CONTEXT (t);
11655 /* If no such tag is yet defined, create a forward-reference node
11656 and record it as the "definition".
11657 When a real declaration of this type is found,
11658 the forward-reference will be altered into a real type. */
11659 if (code == ENUMERAL_TYPE)
11661 error ("use of enum %q#D without previous declaration", name);
11662 return error_mark_node;
11666 t = make_class_type (code);
11667 TYPE_CONTEXT (t) = context;
11668 t = pushtag (name, t, scope);
11673 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11675 if (!redeclare_class_template (t, current_template_parms))
11676 return error_mark_node;
11678 else if (!processing_template_decl
11679 && CLASS_TYPE_P (t)
11680 && CLASSTYPE_IS_TEMPLATE (t))
11682 error ("redeclaration of %qT as a non-template", t);
11683 error ("previous declaration %q+D", t);
11684 return error_mark_node;
11687 /* Make injected friend class visible. */
11688 if (scope != ts_within_enclosing_non_class
11689 && hidden_name_p (TYPE_NAME (t)))
11691 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11692 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11694 if (TYPE_TEMPLATE_INFO (t))
11696 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11697 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11705 /* Wrapper for xref_tag_1. */
11708 xref_tag (enum tag_types tag_code, tree name,
11709 tag_scope scope, bool template_header_p)
11713 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11714 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11715 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11721 xref_tag_from_type (tree old, tree id, tag_scope scope)
11723 enum tag_types tag_kind;
11725 if (TREE_CODE (old) == RECORD_TYPE)
11726 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11728 tag_kind = union_type;
11730 if (id == NULL_TREE)
11731 id = TYPE_IDENTIFIER (old);
11733 return xref_tag (tag_kind, id, scope, false);
11736 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11737 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11738 access_* node, and the TREE_VALUE is the type of the base-class.
11739 Non-NULL TREE_TYPE indicates virtual inheritance.
11741 Returns true if the binfo hierarchy was successfully created,
11742 false if an error was detected. */
11745 xref_basetypes (tree ref, tree base_list)
11748 tree binfo, base_binfo;
11749 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11750 unsigned max_bases = 0; /* Maximum direct bases. */
11752 tree default_access;
11753 tree igo_prev; /* Track Inheritance Graph Order. */
11755 if (ref == error_mark_node)
11758 /* The base of a derived class is private by default, all others are
11760 default_access = (TREE_CODE (ref) == RECORD_TYPE
11761 && CLASSTYPE_DECLARED_CLASS (ref)
11762 ? access_private_node : access_public_node);
11764 /* First, make sure that any templates in base-classes are
11765 instantiated. This ensures that if we call ourselves recursively
11766 we do not get confused about which classes are marked and which
11768 basep = &base_list;
11771 tree basetype = TREE_VALUE (*basep);
11773 if (!(processing_template_decl && uses_template_parms (basetype))
11774 && !complete_type_or_else (basetype, NULL))
11775 /* An incomplete type. Remove it from the list. */
11776 *basep = TREE_CHAIN (*basep);
11780 if (TREE_TYPE (*basep))
11782 if (CLASS_TYPE_P (basetype))
11783 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11784 basep = &TREE_CHAIN (*basep);
11788 TYPE_MARKED_P (ref) = 1;
11790 /* The binfo slot should be empty, unless this is an (ill-formed)
11792 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11794 error ("redefinition of %q#T", ref);
11798 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11800 binfo = make_tree_binfo (max_bases);
11802 TYPE_BINFO (ref) = binfo;
11803 BINFO_OFFSET (binfo) = size_zero_node;
11804 BINFO_TYPE (binfo) = ref;
11806 /* Apply base-class info set up to the variants of this type. */
11807 fixup_type_variants (ref);
11811 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11812 /* An aggregate cannot have baseclasses. */
11813 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11815 if (TREE_CODE (ref) == UNION_TYPE)
11817 error ("derived union %qT invalid", ref);
11824 if (TYPE_FOR_JAVA (ref))
11826 error ("Java class %qT cannot have multiple bases", ref);
11833 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11835 if (TYPE_FOR_JAVA (ref))
11837 error ("Java class %qT cannot have virtual bases", ref);
11842 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11844 tree access = TREE_PURPOSE (base_list);
11845 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11846 tree basetype = TREE_VALUE (base_list);
11848 if (access == access_default_node)
11849 access = default_access;
11851 if (PACK_EXPANSION_P (basetype))
11852 basetype = PACK_EXPANSION_PATTERN (basetype);
11853 if (TREE_CODE (basetype) == TYPE_DECL)
11854 basetype = TREE_TYPE (basetype);
11855 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11857 error ("base type %qT fails to be a struct or class type",
11862 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11863 TYPE_FOR_JAVA (ref) = 1;
11865 base_binfo = NULL_TREE;
11866 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11868 base_binfo = TYPE_BINFO (basetype);
11869 /* The original basetype could have been a typedef'd type. */
11870 basetype = BINFO_TYPE (base_binfo);
11872 /* Inherit flags from the base. */
11873 TYPE_HAS_NEW_OPERATOR (ref)
11874 |= TYPE_HAS_NEW_OPERATOR (basetype);
11875 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11876 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11877 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11878 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11879 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11880 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11881 CLASSTYPE_REPEATED_BASE_P (ref)
11882 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11885 /* We must do this test after we've seen through a typedef
11887 if (TYPE_MARKED_P (basetype))
11889 if (basetype == ref)
11890 error ("recursive type %qT undefined", basetype);
11892 error ("duplicate base type %qT invalid", basetype);
11896 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11897 /* Regenerate the pack expansion for the bases. */
11898 basetype = make_pack_expansion (basetype);
11900 TYPE_MARKED_P (basetype) = 1;
11902 base_binfo = copy_binfo (base_binfo, basetype, ref,
11903 &igo_prev, via_virtual);
11904 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11905 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11907 BINFO_BASE_APPEND (binfo, base_binfo);
11908 BINFO_BASE_ACCESS_APPEND (binfo, access);
11911 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11912 /* If we have space in the vbase vector, we must have shared at
11913 least one of them, and are therefore diamond shaped. */
11914 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11916 /* Unmark all the types. */
11917 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11918 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11919 TYPE_MARKED_P (ref) = 0;
11921 /* Now see if we have a repeated base type. */
11922 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11924 for (base_binfo = binfo; base_binfo;
11925 base_binfo = TREE_CHAIN (base_binfo))
11927 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11929 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11932 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11934 for (base_binfo = binfo; base_binfo;
11935 base_binfo = TREE_CHAIN (base_binfo))
11936 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11937 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11946 /* Copies the enum-related properties from type SRC to type DST.
11947 Used with the underlying type of an enum and the enum itself. */
11949 copy_type_enum (tree dst, tree src)
11952 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
11954 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
11955 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
11956 TYPE_SIZE (t) = TYPE_SIZE (src);
11957 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
11958 SET_TYPE_MODE (dst, TYPE_MODE (src));
11959 TYPE_PRECISION (t) = TYPE_PRECISION (src);
11960 TYPE_ALIGN (t) = TYPE_ALIGN (src);
11961 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
11962 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
11966 /* Begin compiling the definition of an enumeration type.
11969 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11971 UNDERLYING_TYPE is the type that will be used as the storage for
11972 the enumeration type. This should be NULL_TREE if no storage type
11975 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11977 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11979 Returns the type object, as yet incomplete.
11980 Also records info about it so that build_enumerator
11981 may be used to declare the individual values as they are read. */
11984 start_enum (tree name, tree enumtype, tree underlying_type,
11985 bool scoped_enum_p, bool *is_new)
11987 tree prevtype = NULL_TREE;
11988 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11992 /* [C++0x dcl.enum]p5:
11994 If not explicitly specified, the underlying type of a scoped
11995 enumeration type is int. */
11996 if (!underlying_type && scoped_enum_p)
11997 underlying_type = integer_type_node;
11999 if (underlying_type)
12000 underlying_type = cv_unqualified (underlying_type);
12002 /* If this is the real definition for a previous forward reference,
12003 fill in the contents in the same object that used to be the
12004 forward reference. */
12006 enumtype = lookup_and_check_tag (enum_type, name,
12007 /*tag_scope=*/ts_current,
12008 /*template_header_p=*/false);
12010 /* In case of a template_decl, the only check that should be deferred
12011 to instantiation time is the comparison of underlying types. */
12012 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12014 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12016 error_at (input_location, "scoped/unscoped mismatch "
12017 "in enum %q#T", enumtype);
12018 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12019 "previous definition here");
12020 enumtype = error_mark_node;
12022 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12024 error_at (input_location, "underlying type mismatch "
12025 "in enum %q#T", enumtype);
12026 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12027 "previous definition here");
12028 enumtype = error_mark_node;
12030 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12031 && !dependent_type_p (underlying_type)
12032 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12033 && !same_type_p (underlying_type,
12034 ENUM_UNDERLYING_TYPE (enumtype)))
12036 error_at (input_location, "different underlying type "
12037 "in enum %q#T", enumtype);
12038 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12039 "previous definition here");
12040 underlying_type = NULL_TREE;
12044 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12045 || processing_template_decl)
12047 /* In case of error, make a dummy enum to allow parsing to
12049 if (enumtype == error_mark_node)
12051 name = make_anon_name ();
12052 enumtype = NULL_TREE;
12055 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12056 of an opaque enum, or an opaque enum of an already defined
12057 enumeration (C++0x only).
12058 In any other case, it'll be NULL_TREE. */
12064 prevtype = enumtype;
12066 /* Do not push the decl more than once, unless we need to
12067 compare underlying types at instantiation time */
12069 || (underlying_type
12070 && dependent_type_p (underlying_type))
12071 || (ENUM_UNDERLYING_TYPE (enumtype)
12072 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12074 enumtype = cxx_make_type (ENUMERAL_TYPE);
12075 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12078 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12081 if (enumtype == error_mark_node)
12082 return error_mark_node;
12084 /* The enum is considered opaque until the opening '{' of the
12085 enumerator list. */
12086 SET_OPAQUE_ENUM_P (enumtype, true);
12087 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12090 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12092 if (underlying_type)
12094 if (CP_INTEGRAL_TYPE_P (underlying_type))
12096 copy_type_enum (enumtype, underlying_type);
12097 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12099 else if (dependent_type_p (underlying_type))
12100 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12102 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12103 underlying_type, enumtype);
12106 /* If into a template class, the returned enum is always the first
12107 declaration (opaque or not) seen. This way all the references to
12108 this type will be to the same declaration. The following ones are used
12109 only to check for definition errors. */
12110 if (prevtype && processing_template_decl)
12116 /* After processing and defining all the values of an enumeration type,
12117 install their decls in the enumeration type.
12118 ENUMTYPE is the type object. */
12121 finish_enum_value_list (tree enumtype)
12124 tree underlying_type;
12127 tree minnode, maxnode;
12130 bool fixed_underlying_type_p
12131 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12133 /* We built up the VALUES in reverse order. */
12134 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12136 /* For an enum defined in a template, just set the type of the values;
12137 all further processing is postponed until the template is
12138 instantiated. We need to set the type so that tsubst of a CONST_DECL
12140 if (processing_template_decl)
12142 for (values = TYPE_VALUES (enumtype);
12144 values = TREE_CHAIN (values))
12145 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12149 /* Determine the minimum and maximum values of the enumerators. */
12150 if (TYPE_VALUES (enumtype))
12152 minnode = maxnode = NULL_TREE;
12154 for (values = TYPE_VALUES (enumtype);
12156 values = TREE_CHAIN (values))
12158 decl = TREE_VALUE (values);
12160 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12161 each enumerator has the type of its enumeration. Prior to the
12162 closing brace, the type of each enumerator is the type of its
12163 initializing value. */
12164 TREE_TYPE (decl) = enumtype;
12166 /* Update the minimum and maximum values, if appropriate. */
12167 value = DECL_INITIAL (decl);
12168 if (value == error_mark_node)
12169 value = integer_zero_node;
12170 /* Figure out what the minimum and maximum values of the
12171 enumerators are. */
12173 minnode = maxnode = value;
12174 else if (tree_int_cst_lt (maxnode, value))
12176 else if (tree_int_cst_lt (value, minnode))
12183 If the enumerator-list is empty, the underlying type is as if
12184 the enumeration had a single enumerator with value 0. */
12185 minnode = maxnode = integer_zero_node;
12187 if (!fixed_underlying_type_p)
12189 /* Compute the number of bits require to represent all values of the
12190 enumeration. We must do this before the type of MINNODE and
12191 MAXNODE are transformed, since tree_int_cst_min_precision relies
12192 on the TREE_TYPE of the value it is passed. */
12193 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12194 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12195 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12196 int precision = MAX (lowprec, highprec);
12198 bool use_short_enum;
12200 /* Determine the underlying type of the enumeration.
12204 The underlying type of an enumeration is an integral type that
12205 can represent all the enumerator values defined in the
12206 enumeration. It is implementation-defined which integral type is
12207 used as the underlying type for an enumeration except that the
12208 underlying type shall not be larger than int unless the value of
12209 an enumerator cannot fit in an int or unsigned int.
12211 We use "int" or an "unsigned int" as the underlying type, even if
12212 a smaller integral type would work, unless the user has
12213 explicitly requested that we use the smallest possible type. The
12214 user can request that for all enumerations with a command line
12215 flag, or for just one enumeration with an attribute. */
12217 use_short_enum = flag_short_enums
12218 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12220 for (itk = (use_short_enum ? itk_char : itk_int);
12224 underlying_type = integer_types[itk];
12225 if (underlying_type != NULL_TREE
12226 && TYPE_PRECISION (underlying_type) >= precision
12227 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12230 if (itk == itk_none)
12234 IF no integral type can represent all the enumerator values, the
12235 enumeration is ill-formed. */
12236 error ("no integral type can represent all of the enumerator values "
12237 "for %qT", enumtype);
12238 precision = TYPE_PRECISION (long_long_integer_type_node);
12239 underlying_type = integer_types[itk_unsigned_long_long];
12244 The value of sizeof() applied to an enumeration type, an object
12245 of an enumeration type, or an enumerator, is the value of sizeof()
12246 applied to the underlying type. */
12247 copy_type_enum (enumtype, underlying_type);
12249 /* Compute the minimum and maximum values for the type.
12253 For an enumeration where emin is the smallest enumerator and emax
12254 is the largest, the values of the enumeration are the values of the
12255 underlying type in the range bmin to bmax, where bmin and bmax are,
12256 respectively, the smallest and largest values of the smallest bit-
12257 field that can store emin and emax. */
12259 /* The middle-end currently assumes that types with TYPE_PRECISION
12260 narrower than their underlying type are suitably zero or sign
12261 extended to fill their mode. Similarly, it assumes that the front
12262 end assures that a value of a particular type must be within
12263 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12265 We used to set these fields based on bmin and bmax, but that led
12266 to invalid assumptions like optimizing away bounds checking. So
12267 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12268 TYPE_MAX_VALUE to the values for the mode above and only restrict
12269 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12270 ENUM_UNDERLYING_TYPE (enumtype)
12271 = build_distinct_type_copy (underlying_type);
12272 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12273 set_min_and_max_values_for_integral_type
12274 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12276 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12277 if (flag_strict_enums)
12278 set_min_and_max_values_for_integral_type (enumtype, precision,
12282 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12284 /* Convert each of the enumerators to the type of the underlying
12285 type of the enumeration. */
12286 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12288 location_t saved_location;
12290 decl = TREE_VALUE (values);
12291 saved_location = input_location;
12292 input_location = DECL_SOURCE_LOCATION (decl);
12293 if (fixed_underlying_type_p)
12294 /* If the enumeration type has a fixed underlying type, we
12295 already checked all of the enumerator values. */
12296 value = DECL_INITIAL (decl);
12298 value = perform_implicit_conversion (underlying_type,
12299 DECL_INITIAL (decl),
12300 tf_warning_or_error);
12301 input_location = saved_location;
12303 /* Do not clobber shared ints. */
12304 value = copy_node (value);
12306 TREE_TYPE (value) = enumtype;
12307 DECL_INITIAL (decl) = value;
12310 /* Fix up all variant types of this enum type. */
12311 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12312 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12314 /* Finish debugging output for this type. */
12315 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12318 /* Finishes the enum type. This is called only the first time an
12319 enumeration is seen, be it opaque or odinary.
12320 ENUMTYPE is the type object. */
12323 finish_enum (tree enumtype)
12325 if (processing_template_decl)
12327 if (at_function_scope_p ())
12328 add_stmt (build_min (TAG_DEFN, enumtype));
12332 /* If this is a forward declaration, there should not be any variants,
12333 though we can get a variant in the middle of an enum-specifier with
12334 wacky code like 'enum E { e = sizeof(const E*) };' */
12335 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12336 && (TYPE_VALUES (enumtype)
12337 || !TYPE_NEXT_VARIANT (enumtype)));
12340 /* Build and install a CONST_DECL for an enumeration constant of the
12341 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12342 LOC is the location of NAME.
12343 Assignment of sequential values by default is handled here. */
12346 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12352 /* If the VALUE was erroneous, pretend it wasn't there; that will
12353 result in the enum being assigned the next value in sequence. */
12354 if (value == error_mark_node)
12357 /* Remove no-op casts from the value. */
12359 STRIP_TYPE_NOPS (value);
12361 if (! processing_template_decl)
12363 /* Validate and default VALUE. */
12364 if (value != NULL_TREE)
12366 value = cxx_constant_value (value);
12368 if (TREE_CODE (value) == INTEGER_CST
12369 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12371 value = perform_integral_promotions (value);
12375 error ("enumerator value for %qD is not an integer constant", name);
12380 /* Default based on previous value. */
12381 if (value == NULL_TREE)
12383 if (TYPE_VALUES (enumtype))
12386 unsigned HOST_WIDE_INT lo;
12390 /* C++03 7.2/4: If no initializer is specified for the first
12391 enumerator, the type is an unspecified integral
12392 type. Otherwise the type is the same as the type of the
12393 initializing value of the preceding enumerator unless the
12394 incremented value is not representable in that type, in
12395 which case the type is an unspecified integral type
12396 sufficient to contain the incremented value. */
12397 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12398 if (error_operand_p (prev_value))
12399 value = error_mark_node;
12402 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12403 TREE_INT_CST_HIGH (prev_value),
12408 tree type = TREE_TYPE (prev_value);
12409 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12410 di.low = lo; di.high = hi;
12411 if (!double_int_fits_to_tree_p (type, di))
12414 for (itk = itk_int; itk != itk_none; itk++)
12416 type = integer_types[itk];
12417 if (type != NULL_TREE
12418 && (pos || !TYPE_UNSIGNED (type))
12419 && double_int_fits_to_tree_p (type, di))
12422 if (type && cxx_dialect < cxx0x
12423 && itk > itk_unsigned_long)
12424 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12425 incremented enumerator value is too large for %<unsigned long%>" : "\
12426 incremented enumerator value is too large for %<long%>");
12428 if (type == NULL_TREE)
12431 value = double_int_to_tree (type, di);
12436 error ("overflow in enumeration values at %qD", name);
12437 value = error_mark_node;
12442 value = integer_zero_node;
12445 /* Remove no-op casts from the value. */
12446 STRIP_TYPE_NOPS (value);
12448 /* If the underlying type of the enum is fixed, check whether
12449 the enumerator values fits in the underlying type. If it
12450 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12451 if (ENUM_UNDERLYING_TYPE (enumtype)
12453 && TREE_CODE (value) == INTEGER_CST
12454 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12456 error ("enumerator value %E is too large for underlying type %<%T%>",
12457 value, ENUM_UNDERLYING_TYPE (enumtype));
12459 /* Silently convert the value so that we can continue. */
12460 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12465 /* C++ associates enums with global, function, or class declarations. */
12466 context = current_scope ();
12468 /* Build the actual enumeration constant. Note that the enumeration
12469 constants have the underlying type of the enum (if it is fixed)
12470 or the type of their initializer (if the underlying type of the
12471 enum is not fixed):
12475 If the underlying type is fixed, the type of each enumerator
12476 prior to the closing brace is the underlying type; if the
12477 initializing value of an enumerator cannot be represented by
12478 the underlying type, the program is ill-formed. If the
12479 underlying type is not fixed, the type of each enumerator is
12480 the type of its initializing value.
12482 If the underlying type is not fixed, it will be computed by
12483 finish_enum and we will reset the type of this enumerator. Of
12484 course, if we're processing a template, there may be no value. */
12485 type = value ? TREE_TYPE (value) : NULL_TREE;
12487 if (context && context == current_class_type)
12488 /* This enum declaration is local to the class. We need the full
12489 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12490 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12492 /* It's a global enum, or it's local to a function. (Note local to
12493 a function could mean local to a class method. */
12494 decl = build_decl (loc, CONST_DECL, name, type);
12496 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12497 TREE_CONSTANT (decl) = 1;
12498 TREE_READONLY (decl) = 1;
12499 DECL_INITIAL (decl) = value;
12501 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12502 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12503 on the TYPE_FIELDS list for `S'. (That's so that you can say
12504 things like `S::i' later.) */
12505 finish_member_declaration (decl);
12509 /* Add this enumeration constant to the list for this type. */
12510 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12513 /* Look for an enumerator with the given NAME within the enumeration
12514 type ENUMTYPE. This routine is used primarily for qualified name
12515 lookup into an enumerator in C++0x, e.g.,
12517 enum class Color { Red, Green, Blue };
12519 Color color = Color::Red;
12521 Returns the value corresponding to the enumerator, or
12522 NULL_TREE if no such enumerator was found. */
12524 lookup_enumerator (tree enumtype, tree name)
12527 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12529 e = purpose_member (name, TYPE_VALUES (enumtype));
12530 return e? TREE_VALUE (e) : NULL_TREE;
12534 /* We're defining DECL. Make sure that its type is OK. */
12537 check_function_type (tree decl, tree current_function_parms)
12539 tree fntype = TREE_TYPE (decl);
12540 tree return_type = complete_type (TREE_TYPE (fntype));
12542 /* In a function definition, arg types must be complete. */
12543 require_complete_types_for_parms (current_function_parms);
12545 if (dependent_type_p (return_type))
12547 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12548 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12550 tree args = TYPE_ARG_TYPES (fntype);
12552 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12553 error ("return type %q#T is incomplete", return_type);
12555 error ("return type has Java class type %q#T", return_type);
12557 /* Make it return void instead. */
12558 if (TREE_CODE (fntype) == METHOD_TYPE)
12559 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12561 TREE_CHAIN (args));
12563 fntype = build_function_type (void_type_node, args);
12565 = build_exception_variant (fntype,
12566 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12567 fntype = (cp_build_type_attribute_variant
12568 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12569 TREE_TYPE (decl) = fntype;
12572 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12575 /* Create the FUNCTION_DECL for a function definition.
12576 DECLSPECS and DECLARATOR are the parts of the declaration;
12577 they describe the function's name and the type it returns,
12578 but twisted together in a fashion that parallels the syntax of C.
12580 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12581 DECLARATOR is really the DECL for the function we are about to
12582 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12583 indicating that the function is an inline defined in-class.
12585 This function creates a binding context for the function body
12586 as well as setting up the FUNCTION_DECL in current_function_decl.
12588 For C++, we must first check whether that datum makes any sense.
12589 For example, "class A local_a(1,2);" means that variable local_a
12590 is an aggregate of type A, which should have a constructor
12591 applied to it with the argument list [1, 2].
12593 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12594 or may be a BLOCK if the function has been defined previously
12595 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12596 error_mark_node if the function has never been defined, or
12597 a BLOCK if the function has been defined somewhere. */
12600 start_preparsed_function (tree decl1, tree attrs, int flags)
12602 tree ctype = NULL_TREE;
12605 int doing_friend = 0;
12606 cp_binding_level *bl;
12607 tree current_function_parms;
12608 struct c_fileinfo *finfo
12609 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12610 bool honor_interface;
12612 /* Sanity check. */
12613 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12614 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12616 fntype = TREE_TYPE (decl1);
12617 if (TREE_CODE (fntype) == METHOD_TYPE)
12618 ctype = TYPE_METHOD_BASETYPE (fntype);
12620 /* ISO C++ 11.4/5. A friend function defined in a class is in
12621 the (lexical) scope of the class in which it is defined. */
12622 if (!ctype && DECL_FRIEND_P (decl1))
12624 ctype = DECL_FRIEND_CONTEXT (decl1);
12626 /* CTYPE could be null here if we're dealing with a template;
12627 for example, `inline friend float foo()' inside a template
12628 will have no CTYPE set. */
12629 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12635 if (DECL_DECLARED_INLINE_P (decl1)
12636 && lookup_attribute ("noinline", attrs))
12637 warning (0, "inline function %q+D given attribute noinline", decl1);
12639 /* Handle gnu_inline attribute. */
12640 if (GNU_INLINE_P (decl1))
12642 DECL_EXTERNAL (decl1) = 1;
12643 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12644 DECL_INTERFACE_KNOWN (decl1) = 1;
12645 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12648 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12649 /* This is a constructor, we must ensure that any default args
12650 introduced by this definition are propagated to the clones
12651 now. The clones are used directly in overload resolution. */
12652 adjust_clone_args (decl1);
12654 /* Sometimes we don't notice that a function is a static member, and
12655 build a METHOD_TYPE for it. Fix that up now. */
12656 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12657 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12659 /* Set up current_class_type, and enter the scope of the class, if
12662 push_nested_class (ctype);
12663 else if (DECL_STATIC_FUNCTION_P (decl1))
12664 push_nested_class (DECL_CONTEXT (decl1));
12666 /* Now that we have entered the scope of the class, we must restore
12667 the bindings for any template parameters surrounding DECL1, if it
12668 is an inline member template. (Order is important; consider the
12669 case where a template parameter has the same name as a field of
12670 the class.) It is not until after this point that
12671 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12672 if (flags & SF_INCLASS_INLINE)
12673 maybe_begin_member_template_processing (decl1);
12675 /* Effective C++ rule 15. */
12677 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12678 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12679 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12681 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12682 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12683 if (!DECL_INITIAL (decl1))
12684 DECL_INITIAL (decl1) = error_mark_node;
12686 /* This function exists in static storage.
12687 (This does not mean `static' in the C sense!) */
12688 TREE_STATIC (decl1) = 1;
12690 /* We must call push_template_decl after current_class_type is set
12691 up. (If we are processing inline definitions after exiting a
12692 class scope, current_class_type will be NULL_TREE until set above
12693 by push_nested_class.) */
12694 if (processing_template_decl)
12696 /* FIXME: Handle error_mark_node more gracefully. */
12697 tree newdecl1 = push_template_decl (decl1);
12698 if (newdecl1 != error_mark_node)
12702 /* We are now in the scope of the function being defined. */
12703 current_function_decl = decl1;
12705 /* Save the parm names or decls from this function's declarator
12706 where store_parm_decls will find them. */
12707 current_function_parms = DECL_ARGUMENTS (decl1);
12709 /* Make sure the parameter and return types are reasonable. When
12710 you declare a function, these types can be incomplete, but they
12711 must be complete when you define the function. */
12712 check_function_type (decl1, current_function_parms);
12714 /* Build the return declaration for the function. */
12715 restype = TREE_TYPE (fntype);
12716 if (DECL_RESULT (decl1) == NULL_TREE)
12720 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12721 DECL_ARTIFICIAL (resdecl) = 1;
12722 DECL_IGNORED_P (resdecl) = 1;
12723 DECL_RESULT (decl1) = resdecl;
12725 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12728 /* Let the user know we're compiling this function. */
12729 announce_function (decl1);
12731 /* Record the decl so that the function name is defined.
12732 If we already have a decl for this name, and it is a FUNCTION_DECL,
12733 use the old decl. */
12734 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12736 /* A specialization is not used to guide overload resolution. */
12737 if (!DECL_FUNCTION_MEMBER_P (decl1)
12738 && !(DECL_USE_TEMPLATE (decl1) &&
12739 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12741 tree olddecl = pushdecl (decl1);
12743 if (olddecl == error_mark_node)
12744 /* If something went wrong when registering the declaration,
12745 use DECL1; we have to have a FUNCTION_DECL to use when
12746 parsing the body of the function. */
12750 /* Otherwise, OLDDECL is either a previous declaration
12751 of the same function or DECL1 itself. */
12753 if (warn_missing_declarations
12754 && olddecl == decl1
12755 && !DECL_MAIN_P (decl1)
12756 && TREE_PUBLIC (decl1)
12757 && !DECL_DECLARED_INLINE_P (decl1))
12761 /* Check whether DECL1 is in an anonymous
12763 for (context = DECL_CONTEXT (decl1);
12765 context = DECL_CONTEXT (context))
12767 if (TREE_CODE (context) == NAMESPACE_DECL
12768 && DECL_NAME (context) == NULL_TREE)
12772 if (context == NULL)
12773 warning (OPT_Wmissing_declarations,
12774 "no previous declaration for %q+D", decl1);
12782 /* We need to set the DECL_CONTEXT. */
12783 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12784 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12786 fntype = TREE_TYPE (decl1);
12788 /* If #pragma weak applies, mark the decl appropriately now.
12789 The pragma only applies to global functions. Because
12790 determining whether or not the #pragma applies involves
12791 computing the mangled name for the declaration, we cannot
12792 apply the pragma until after we have merged this declaration
12793 with any previous declarations; if the original declaration
12794 has a linkage specification, that specification applies to
12795 the definition as well, and may affect the mangled name. */
12796 if (DECL_FILE_SCOPE_P (decl1))
12797 maybe_apply_pragma_weak (decl1);
12800 /* Reset this in case the call to pushdecl changed it. */
12801 current_function_decl = decl1;
12803 gcc_assert (DECL_INITIAL (decl1));
12805 /* This function may already have been parsed, in which case just
12806 return; our caller will skip over the body without parsing. */
12807 if (DECL_INITIAL (decl1) != error_mark_node)
12810 /* Initialize RTL machinery. We cannot do this until
12811 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12812 even when processing a template; this is how we get
12813 CFUN set up, and our per-function variables initialized.
12814 FIXME factor out the non-RTL stuff. */
12815 bl = current_binding_level;
12816 allocate_struct_function (decl1, processing_template_decl);
12818 /* Initialize the language data structures. Whenever we start
12819 a new function, we destroy temporaries in the usual way. */
12820 cfun->language = ggc_alloc_cleared_language_function ();
12821 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12822 current_binding_level = bl;
12824 /* Start the statement-tree, start the tree now. */
12825 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12827 /* If we are (erroneously) defining a function that we have already
12828 defined before, wipe out what we knew before. */
12829 if (!DECL_PENDING_INLINE_P (decl1))
12830 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12832 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12834 /* We know that this was set up by `grokclassfn'. We do not
12835 wait until `store_parm_decls', since evil parse errors may
12836 never get us to that point. Here we keep the consistency
12837 between `current_class_type' and `current_class_ptr'. */
12838 tree t = DECL_ARGUMENTS (decl1);
12840 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12841 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12843 cp_function_chain->x_current_class_ref
12844 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12845 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12846 cp_function_chain->x_current_class_ptr = t;
12848 /* Constructors and destructors need to know whether they're "in
12849 charge" of initializing virtual base classes. */
12850 t = DECL_CHAIN (t);
12851 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12853 current_in_charge_parm = t;
12854 t = DECL_CHAIN (t);
12856 if (DECL_HAS_VTT_PARM_P (decl1))
12858 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12859 current_vtt_parm = t;
12863 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12864 /* Implicitly-defined methods (like the
12865 destructor for a class in which no destructor
12866 is explicitly declared) must not be defined
12867 until their definition is needed. So, we
12868 ignore interface specifications for
12869 compiler-generated functions. */
12870 && !DECL_ARTIFICIAL (decl1));
12872 if (processing_template_decl)
12873 /* Don't mess with interface flags. */;
12874 else if (DECL_INTERFACE_KNOWN (decl1))
12876 tree ctx = decl_function_context (decl1);
12878 if (DECL_NOT_REALLY_EXTERN (decl1))
12879 DECL_EXTERNAL (decl1) = 0;
12881 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12882 && TREE_PUBLIC (ctx))
12883 /* This is a function in a local class in an extern inline
12885 comdat_linkage (decl1);
12887 /* If this function belongs to an interface, it is public.
12888 If it belongs to someone else's interface, it is also external.
12889 This only affects inlines and template instantiations. */
12890 else if (!finfo->interface_unknown && honor_interface)
12892 if (DECL_DECLARED_INLINE_P (decl1)
12893 || DECL_TEMPLATE_INSTANTIATION (decl1))
12895 DECL_EXTERNAL (decl1)
12896 = (finfo->interface_only
12897 || (DECL_DECLARED_INLINE_P (decl1)
12898 && ! flag_implement_inlines
12899 && !DECL_VINDEX (decl1)));
12901 /* For WIN32 we also want to put these in linkonce sections. */
12902 maybe_make_one_only (decl1);
12905 DECL_EXTERNAL (decl1) = 0;
12906 DECL_INTERFACE_KNOWN (decl1) = 1;
12907 /* If this function is in an interface implemented in this file,
12908 make sure that the back end knows to emit this function
12910 if (!DECL_EXTERNAL (decl1))
12911 mark_needed (decl1);
12913 else if (finfo->interface_unknown && finfo->interface_only
12914 && honor_interface)
12916 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12917 interface, we will have both finfo->interface_unknown and
12918 finfo->interface_only set. In that case, we don't want to
12919 use the normal heuristics because someone will supply a
12920 #pragma implementation elsewhere, and deducing it here would
12921 produce a conflict. */
12922 comdat_linkage (decl1);
12923 DECL_EXTERNAL (decl1) = 0;
12924 DECL_INTERFACE_KNOWN (decl1) = 1;
12925 DECL_DEFER_OUTPUT (decl1) = 1;
12929 /* This is a definition, not a reference.
12930 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12931 if (!GNU_INLINE_P (decl1))
12932 DECL_EXTERNAL (decl1) = 0;
12934 if ((DECL_DECLARED_INLINE_P (decl1)
12935 || DECL_TEMPLATE_INSTANTIATION (decl1))
12936 && ! DECL_INTERFACE_KNOWN (decl1))
12937 DECL_DEFER_OUTPUT (decl1) = 1;
12939 DECL_INTERFACE_KNOWN (decl1) = 1;
12942 /* Determine the ELF visibility attribute for the function. We must not
12943 do this before calling "pushdecl", as we must allow "duplicate_decls"
12944 to merge any attributes appropriately. We also need to wait until
12946 if (!DECL_CLONED_FUNCTION_P (decl1))
12947 determine_visibility (decl1);
12949 begin_scope (sk_function_parms, decl1);
12953 if (DECL_DESTRUCTOR_P (decl1)
12954 || (DECL_CONSTRUCTOR_P (decl1)
12955 && targetm.cxx.cdtor_returns_this ()))
12957 cdtor_label = build_decl (input_location,
12958 LABEL_DECL, NULL_TREE, NULL_TREE);
12959 DECL_CONTEXT (cdtor_label) = current_function_decl;
12962 start_fname_decls ();
12964 store_parm_decls (current_function_parms);
12968 /* Like start_preparsed_function, except that instead of a
12969 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12971 Returns 1 on success. If the DECLARATOR is not suitable for a function
12972 (it defines a datum instead), we return 0, which tells
12973 yyparse to report a parse error. */
12976 start_function (cp_decl_specifier_seq *declspecs,
12977 const cp_declarator *declarator,
12982 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12983 if (decl1 == error_mark_node)
12985 /* If the declarator is not suitable for a function definition,
12986 cause a syntax error. */
12987 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12989 error ("invalid function declaration");
12993 if (DECL_MAIN_P (decl1))
12994 /* main must return int. grokfndecl should have corrected it
12995 (and issued a diagnostic) if the user got it wrong. */
12996 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12997 integer_type_node));
12999 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13004 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13008 use_eh_spec_block (tree fn)
13010 return (flag_exceptions && flag_enforce_eh_specs
13011 && !processing_template_decl
13012 && !type_throw_all_p (TREE_TYPE (fn))
13013 /* We insert the EH_SPEC_BLOCK only in the original
13014 function; then, it is copied automatically to the
13016 && !DECL_CLONED_FUNCTION_P (fn)
13017 /* Implicitly-generated constructors and destructors have
13018 exception specifications. However, those specifications
13019 are the union of the possible exceptions specified by the
13020 constructors/destructors for bases and members, so no
13021 unallowed exception will ever reach this function. By
13022 not creating the EH_SPEC_BLOCK we save a little memory,
13023 and we avoid spurious warnings about unreachable
13025 && !DECL_DEFAULTED_FN (fn));
13028 /* Store the parameter declarations into the current function declaration.
13029 This is called after parsing the parameter declarations, before
13030 digesting the body of the function.
13032 Also install to binding contour return value identifier, if any. */
13035 store_parm_decls (tree current_function_parms)
13037 tree fndecl = current_function_decl;
13040 /* This is a chain of any other decls that came in among the parm
13041 declarations. If a parm is declared with enum {foo, bar} x;
13042 then CONST_DECLs for foo and bar are put here. */
13043 tree nonparms = NULL_TREE;
13045 if (current_function_parms)
13047 /* This case is when the function was defined with an ANSI prototype.
13048 The parms already have decls, so we need not do anything here
13049 except record them as in effect
13050 and complain if any redundant old-style parm decls were written. */
13052 tree specparms = current_function_parms;
13055 /* Must clear this because it might contain TYPE_DECLs declared
13057 current_binding_level->names = NULL;
13059 /* If we're doing semantic analysis, then we'll call pushdecl
13060 for each of these. We must do them in reverse order so that
13061 they end in the correct forward order. */
13062 specparms = nreverse (specparms);
13064 for (parm = specparms; parm; parm = next)
13066 next = DECL_CHAIN (parm);
13067 if (TREE_CODE (parm) == PARM_DECL)
13069 if (DECL_NAME (parm) == NULL_TREE
13070 || TREE_CODE (parm) != VOID_TYPE)
13073 error ("parameter %qD declared void", parm);
13077 /* If we find an enum constant or a type tag,
13078 put it aside for the moment. */
13079 TREE_CHAIN (parm) = NULL_TREE;
13080 nonparms = chainon (nonparms, parm);
13084 /* Get the decls in their original chain order and record in the
13085 function. This is all and only the PARM_DECLs that were
13086 pushed into scope by the loop above. */
13087 DECL_ARGUMENTS (fndecl) = getdecls ();
13090 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13092 /* Now store the final chain of decls for the arguments
13093 as the decl-chain of the current lexical scope.
13094 Put the enumerators in as well, at the front so that
13095 DECL_ARGUMENTS is not modified. */
13096 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13098 if (use_eh_spec_block (current_function_decl))
13099 current_eh_spec_block = begin_eh_spec_block ();
13103 /* We have finished doing semantic analysis on DECL, but have not yet
13104 generated RTL for its body. Save away our current state, so that
13105 when we want to generate RTL later we know what to do. */
13108 save_function_data (tree decl)
13110 struct language_function *f;
13112 /* Save the language-specific per-function data so that we can
13113 get it back when we really expand this function. */
13114 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13117 f = ggc_alloc_language_function ();
13118 memcpy (f, cp_function_chain, sizeof (struct language_function));
13119 DECL_SAVED_FUNCTION_DATA (decl) = f;
13121 /* Clear out the bits we don't need. */
13122 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13123 f->bindings = NULL;
13124 f->x_local_names = NULL;
13125 f->base.local_typedefs = NULL;
13129 /* Set the return value of the constructor (if present). */
13132 finish_constructor_body (void)
13137 if (targetm.cxx.cdtor_returns_this ()
13138 && (! TYPE_FOR_JAVA (current_class_type)))
13140 /* Any return from a constructor will end up here. */
13141 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13143 val = DECL_ARGUMENTS (current_function_decl);
13144 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13145 DECL_RESULT (current_function_decl), val);
13146 /* Return the address of the object. */
13147 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13148 add_stmt (exprstmt);
13152 /* Do all the processing for the beginning of a destructor; set up the
13153 vtable pointers and cleanups for bases and members. */
13156 begin_destructor_body (void)
13158 tree compound_stmt;
13160 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13161 issued an error message. We still want to try to process the
13162 body of the function, but initialize_vtbl_ptrs will crash if
13163 TYPE_BINFO is NULL. */
13164 if (COMPLETE_TYPE_P (current_class_type))
13166 compound_stmt = begin_compound_stmt (0);
13167 /* Make all virtual function table pointers in non-virtual base
13168 classes point to CURRENT_CLASS_TYPE's virtual function
13170 initialize_vtbl_ptrs (current_class_ptr);
13171 finish_compound_stmt (compound_stmt);
13173 /* And insert cleanups for our bases and members so that they
13174 will be properly destroyed if we throw. */
13175 push_base_cleanups ();
13179 /* At the end of every destructor we generate code to delete the object if
13180 necessary. Do that now. */
13183 finish_destructor_body (void)
13187 /* Any return from a destructor will end up here; that way all base
13188 and member cleanups will be run when the function returns. */
13189 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13191 /* In a virtual destructor, we must call delete. */
13192 if (DECL_VIRTUAL_P (current_function_decl))
13195 tree virtual_size = cxx_sizeof (current_class_type);
13199 At the point of definition of a virtual destructor (including
13200 an implicit definition), non-placement operator delete shall
13201 be looked up in the scope of the destructor's class and if
13202 found shall be accessible and unambiguous. */
13203 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13205 /*global_p=*/false,
13206 /*placement=*/NULL_TREE,
13207 /*alloc_fn=*/NULL_TREE);
13209 if_stmt = begin_if_stmt ();
13210 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13211 current_in_charge_parm,
13214 finish_expr_stmt (exprstmt);
13215 finish_then_clause (if_stmt);
13216 finish_if_stmt (if_stmt);
13219 if (targetm.cxx.cdtor_returns_this ())
13223 val = DECL_ARGUMENTS (current_function_decl);
13224 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13225 DECL_RESULT (current_function_decl), val);
13226 /* Return the address of the object. */
13227 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13228 add_stmt (exprstmt);
13232 /* Do the necessary processing for the beginning of a function body, which
13233 in this case includes member-initializers, but not the catch clauses of
13234 a function-try-block. Currently, this means opening a binding level
13235 for the member-initializers (in a ctor), member cleanups (in a dtor),
13236 and capture proxies (in a lambda operator()). */
13239 begin_function_body (void)
13243 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13246 if (processing_template_decl)
13247 /* Do nothing now. */;
13249 /* Always keep the BLOCK node associated with the outermost pair of
13250 curly braces of a function. These are needed for correct
13251 operation of dwarfout.c. */
13252 keep_next_level (true);
13254 stmt = begin_compound_stmt (BCS_FN_BODY);
13256 if (processing_template_decl)
13257 /* Do nothing now. */;
13258 else if (DECL_DESTRUCTOR_P (current_function_decl))
13259 begin_destructor_body ();
13264 /* Do the processing for the end of a function body. Currently, this means
13265 closing out the cleanups for fully-constructed bases and members, and in
13266 the case of the destructor, deleting the object if desired. Again, this
13267 is only meaningful for [cd]tors, since they are the only functions where
13268 there is a significant distinction between the main body and any
13269 function catch clauses. Handling, say, main() return semantics here
13270 would be wrong, as flowing off the end of a function catch clause for
13271 main() would also need to return 0. */
13274 finish_function_body (tree compstmt)
13276 if (compstmt == NULL_TREE)
13279 /* Close the block. */
13280 finish_compound_stmt (compstmt);
13282 if (processing_template_decl)
13283 /* Do nothing now. */;
13284 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13285 finish_constructor_body ();
13286 else if (DECL_DESTRUCTOR_P (current_function_decl))
13287 finish_destructor_body ();
13290 /* Given a function, returns the BLOCK corresponding to the outermost level
13291 of curly braces, skipping the artificial block created for constructor
13295 outer_curly_brace_block (tree fndecl)
13297 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13298 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13299 /* Skip the artificial function body block. */
13300 block = BLOCK_SUBBLOCKS (block);
13304 /* If FNDECL is a class's key method, add the class to the list of
13305 keyed classes that should be emitted. */
13308 record_key_method_defined (tree fndecl)
13310 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13311 && DECL_VIRTUAL_P (fndecl)
13312 && !processing_template_decl)
13314 tree fnclass = DECL_CONTEXT (fndecl);
13315 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13316 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13320 /* Subroutine of finish_function.
13321 Save the body of constexpr functions for possible
13322 future compile time evaluation. */
13325 maybe_save_function_definition (tree fun)
13327 if (!processing_template_decl
13328 && DECL_DECLARED_CONSTEXPR_P (fun)
13329 && !DECL_CLONED_FUNCTION_P (fun))
13330 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13333 /* Finish up a function declaration and compile that function
13334 all the way to assembler language output. The free the storage
13335 for the function definition.
13337 FLAGS is a bitwise or of the following values:
13339 We just finished processing the body of an in-class inline
13340 function definition. (This processing will have taken place
13341 after the class definition is complete.) */
13344 finish_function (int flags)
13346 tree fndecl = current_function_decl;
13347 tree fntype, ctype = NULL_TREE;
13348 int inclass_inline = (flags & 2) != 0;
13350 /* When we get some parse errors, we can end up without a
13351 current_function_decl, so cope. */
13352 if (fndecl == NULL_TREE)
13353 return error_mark_node;
13355 if (c_dialect_objc ())
13356 objc_finish_function ();
13358 gcc_assert (!defer_mark_used_calls);
13359 defer_mark_used_calls = true;
13361 record_key_method_defined (fndecl);
13363 fntype = TREE_TYPE (fndecl);
13365 /* TREE_READONLY (fndecl) = 1;
13366 This caused &foo to be of type ptr-to-const-function
13367 which then got a warning when stored in a ptr-to-function variable. */
13369 gcc_assert (building_stmt_list_p ());
13370 /* The current function is being defined, so its DECL_INITIAL should
13371 be set, and unless there's a multiple definition, it should be
13372 error_mark_node. */
13373 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13375 /* For a cloned function, we've already got all the code we need;
13376 there's no need to add any extra bits. */
13377 if (!DECL_CLONED_FUNCTION_P (fndecl))
13379 if (DECL_MAIN_P (current_function_decl))
13381 /* Make it so that `main' always returns 0 by default (or
13384 finish_return_stmt (integer_one_node);
13386 finish_return_stmt (integer_zero_node);
13390 if (use_eh_spec_block (current_function_decl))
13391 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13392 (TREE_TYPE (current_function_decl)),
13393 current_eh_spec_block);
13396 /* If we're saving up tree structure, tie off the function now. */
13397 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13399 finish_fname_decls ();
13401 /* If this function can't throw any exceptions, remember that. */
13402 if (!processing_template_decl
13403 && !cp_function_chain->can_throw
13404 && !flag_non_call_exceptions
13405 && !decl_replaceable_p (fndecl))
13406 TREE_NOTHROW (fndecl) = 1;
13408 /* This must come after expand_function_end because cleanups might
13409 have declarations (from inline functions) that need to go into
13410 this function's blocks. */
13412 /* If the current binding level isn't the outermost binding level
13413 for this function, either there is a bug, or we have experienced
13414 syntax errors and the statement tree is malformed. */
13415 if (current_binding_level->kind != sk_function_parms)
13417 /* Make sure we have already experienced errors. */
13418 gcc_assert (errorcount);
13420 /* Throw away the broken statement tree and extra binding
13422 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13424 while (current_binding_level->kind != sk_function_parms)
13426 if (current_binding_level->kind == sk_class)
13427 pop_nested_class ();
13429 poplevel (0, 0, 0);
13432 poplevel (1, 0, 1);
13434 /* Statements should always be full-expressions at the outermost set
13435 of curly braces for a function. */
13436 gcc_assert (stmts_are_full_exprs_p ());
13438 /* Save constexpr function body before it gets munged by
13439 the NRV transformation. */
13440 maybe_save_function_definition (fndecl);
13442 /* Set up the named return value optimization, if we can. Candidate
13443 variables are selected in check_return_expr. */
13444 if (current_function_return_value)
13446 tree r = current_function_return_value;
13449 if (r != error_mark_node
13450 /* This is only worth doing for fns that return in memory--and
13451 simpler, since we don't have to worry about promoted modes. */
13452 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13453 /* Only allow this for variables declared in the outer scope of
13454 the function so we know that their lifetime always ends with a
13455 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13456 we were to do this optimization in tree-ssa. */
13457 && (outer = outer_curly_brace_block (fndecl))
13458 && chain_member (r, BLOCK_VARS (outer)))
13459 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13461 current_function_return_value = NULL_TREE;
13464 /* Remember that we were in class scope. */
13465 if (current_class_name)
13466 ctype = current_class_type;
13468 /* Must mark the RESULT_DECL as being in this function. */
13469 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13471 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13472 to the FUNCTION_DECL node itself. */
13473 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13475 /* Save away current state, if appropriate. */
13476 if (!processing_template_decl)
13477 save_function_data (fndecl);
13479 /* Complain if there's just no return statement. */
13480 if (warn_return_type
13481 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13482 && !dependent_type_p (TREE_TYPE (fntype))
13483 && !current_function_returns_value && !current_function_returns_null
13484 /* Don't complain if we abort or throw. */
13485 && !current_function_returns_abnormally
13486 /* Don't complain if we are declared noreturn. */
13487 && !TREE_THIS_VOLATILE (fndecl)
13488 && !DECL_NAME (DECL_RESULT (fndecl))
13489 && !TREE_NO_WARNING (fndecl)
13490 /* Structor return values (if any) are set by the compiler. */
13491 && !DECL_CONSTRUCTOR_P (fndecl)
13492 && !DECL_DESTRUCTOR_P (fndecl))
13494 warning (OPT_Wreturn_type,
13495 "no return statement in function returning non-void");
13496 TREE_NO_WARNING (fndecl) = 1;
13499 /* Store the end of the function, so that we get good line number
13500 info for the epilogue. */
13501 cfun->function_end_locus = input_location;
13503 /* Complain about parameters that are only set, but never otherwise used. */
13504 if (warn_unused_but_set_parameter
13505 && !processing_template_decl
13506 && errorcount == unused_but_set_errorcount
13507 && !DECL_CLONED_FUNCTION_P (fndecl))
13511 for (decl = DECL_ARGUMENTS (fndecl);
13513 decl = DECL_CHAIN (decl))
13514 if (TREE_USED (decl)
13515 && TREE_CODE (decl) == PARM_DECL
13516 && !DECL_READ_P (decl)
13517 && DECL_NAME (decl)
13518 && !DECL_ARTIFICIAL (decl)
13519 && !TREE_NO_WARNING (decl)
13520 && !DECL_IN_SYSTEM_HEADER (decl)
13521 && TREE_TYPE (decl) != error_mark_node
13522 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13523 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13524 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13525 warning (OPT_Wunused_but_set_parameter,
13526 "parameter %q+D set but not used", decl);
13527 unused_but_set_errorcount = errorcount;
13530 /* Complain about locally defined typedefs that are not used in this
13532 maybe_warn_unused_local_typedefs ();
13534 /* Genericize before inlining. */
13535 if (!processing_template_decl)
13537 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13538 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13539 cp_genericize (fndecl);
13540 /* Clear out the bits we don't need. */
13541 f->x_current_class_ptr = NULL;
13542 f->x_current_class_ref = NULL;
13543 f->x_eh_spec_block = NULL;
13544 f->x_in_charge_parm = NULL;
13545 f->x_vtt_parm = NULL;
13546 f->x_return_value = NULL;
13547 f->bindings = NULL;
13548 f->extern_decl_map = NULL;
13550 /* Clear out the bits we don't need. */
13551 local_names = NULL;
13553 /* We're leaving the context of this function, so zap cfun. It's still in
13554 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13556 current_function_decl = NULL;
13558 /* If this is an in-class inline definition, we may have to pop the
13559 bindings for the template parameters that we added in
13560 maybe_begin_member_template_processing when start_function was
13562 if (inclass_inline)
13563 maybe_end_member_template_processing ();
13565 /* Leave the scope of the class. */
13567 pop_nested_class ();
13572 current_function_decl = NULL_TREE;
13574 defer_mark_used_calls = false;
13575 if (deferred_mark_used_calls)
13580 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13582 VEC_free (tree, gc, deferred_mark_used_calls);
13588 /* Create the FUNCTION_DECL for a function definition.
13589 DECLSPECS and DECLARATOR are the parts of the declaration;
13590 they describe the return type and the name of the function,
13591 but twisted together in a fashion that parallels the syntax of C.
13593 This function creates a binding context for the function body
13594 as well as setting up the FUNCTION_DECL in current_function_decl.
13596 Returns a FUNCTION_DECL on success.
13598 If the DECLARATOR is not suitable for a function (it defines a datum
13599 instead), we return 0, which tells yyparse to report a parse error.
13601 May return void_type_node indicating that this method is actually
13602 a friend. See grokfield for more details.
13604 Came here with a `.pushlevel' .
13606 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13607 CHANGES TO CODE IN `grokfield'. */
13610 grokmethod (cp_decl_specifier_seq *declspecs,
13611 const cp_declarator *declarator, tree attrlist)
13613 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13616 if (fndecl == error_mark_node)
13617 return error_mark_node;
13619 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13621 error ("invalid member function declaration");
13622 return error_mark_node;
13626 cplus_decl_attributes (&fndecl, attrlist, 0);
13628 /* Pass friends other than inline friend functions back. */
13629 if (fndecl == void_type_node)
13632 if (DECL_IN_AGGR_P (fndecl))
13634 if (DECL_CLASS_SCOPE_P (fndecl))
13635 error ("%qD is already defined in class %qT", fndecl,
13636 DECL_CONTEXT (fndecl));
13637 return error_mark_node;
13640 check_template_shadow (fndecl);
13642 DECL_DECLARED_INLINE_P (fndecl) = 1;
13643 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13645 /* We process method specializations in finish_struct_1. */
13646 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13648 fndecl = push_template_decl (fndecl);
13649 if (fndecl == error_mark_node)
13653 if (! DECL_FRIEND_P (fndecl))
13655 if (DECL_CHAIN (fndecl))
13657 fndecl = copy_node (fndecl);
13658 TREE_CHAIN (fndecl) = NULL_TREE;
13662 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13664 DECL_IN_AGGR_P (fndecl) = 1;
13669 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13670 we can lay it out later, when and if its type becomes complete. */
13673 maybe_register_incomplete_var (tree var)
13675 gcc_assert (TREE_CODE (var) == VAR_DECL);
13677 /* Keep track of variables with incomplete types. */
13678 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13679 && DECL_EXTERNAL (var))
13681 tree inner_type = TREE_TYPE (var);
13683 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13684 inner_type = TREE_TYPE (inner_type);
13685 inner_type = TYPE_MAIN_VARIANT (inner_type);
13687 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13688 /* RTTI TD entries are created while defining the type_info. */
13689 || (TYPE_LANG_SPECIFIC (inner_type)
13690 && TYPE_BEING_DEFINED (inner_type)))
13693 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13695 iv->incomplete_type = inner_type;
13700 /* Called when a class type (given by TYPE) is defined. If there are
13701 any existing VAR_DECLs whose type has been completed by this
13702 declaration, update them now. */
13705 complete_vars (tree type)
13708 incomplete_var *iv;
13710 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13712 if (same_type_p (type, iv->incomplete_type))
13714 tree var = iv->decl;
13715 tree type = TREE_TYPE (var);
13716 /* Complete the type of the variable. The VAR_DECL itself
13717 will be laid out in expand_expr. */
13718 complete_type (type);
13719 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13720 /* Remove this entry from the list. */
13721 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13727 /* Check for pending declarations which may have abstract type. */
13728 complete_type_check_abstract (type);
13731 /* If DECL is of a type which needs a cleanup, build and return an
13732 expression to perform that cleanup here. Return NULL_TREE if no
13733 cleanup need be done. */
13736 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13742 /* Assume no cleanup is required. */
13743 cleanup = NULL_TREE;
13745 if (error_operand_p (decl))
13748 /* Handle "__attribute__((cleanup))". We run the cleanup function
13749 before the destructor since the destructor is what actually
13750 terminates the lifetime of the object. */
13751 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13758 /* Get the name specified by the user for the cleanup function. */
13759 id = TREE_VALUE (TREE_VALUE (attr));
13760 /* Look up the name to find the cleanup function to call. It is
13761 important to use lookup_name here because that is what is
13762 used in c-common.c:handle_cleanup_attribute when performing
13763 initial checks on the attribute. Note that those checks
13764 include ensuring that the function found is not an overloaded
13765 function, or an object with an overloaded call operator,
13766 etc.; we can rely on the fact that the function found is an
13767 ordinary FUNCTION_DECL. */
13768 fn = lookup_name (id);
13769 arg = build_address (decl);
13771 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13772 if (cleanup == error_mark_node)
13773 return error_mark_node;
13775 /* Handle ordinary C++ destructors. */
13776 type = TREE_TYPE (decl);
13777 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13779 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13780 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13781 && CLASSTYPE_VBASECLASSES (type));
13785 if (TREE_CODE (type) == ARRAY_TYPE)
13788 addr = build_address (decl);
13790 /* Optimize for space over speed here. */
13791 if (!has_vbases || flag_expensive_optimizations)
13792 flags |= LOOKUP_NONVIRTUAL;
13794 call = build_delete (TREE_TYPE (addr), addr,
13795 sfk_complete_destructor, flags, 0, complain);
13796 if (call == error_mark_node)
13797 cleanup = error_mark_node;
13799 cleanup = cp_build_compound_expr (cleanup, call, complain);
13807 /* When a stmt has been parsed, this function is called. */
13814 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13815 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13816 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13819 static_fn_type (tree memfntype)
13824 if (TYPE_PTRMEMFUNC_P (memfntype))
13825 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13826 if (POINTER_TYPE_P (memfntype)
13827 || TREE_CODE (memfntype) == FUNCTION_DECL)
13828 memfntype = TREE_TYPE (memfntype);
13829 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13831 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13832 args = TYPE_ARG_TYPES (memfntype);
13833 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13834 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13835 fntype = (cp_build_type_attribute_variant
13836 (fntype, TYPE_ATTRIBUTES (memfntype)));
13837 fntype = (build_exception_variant
13838 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13842 /* DECL was originally constructed as a non-static member function,
13843 but turned out to be static. Update it accordingly. */
13846 revert_static_member_fn (tree decl)
13848 tree stype = static_fn_type (decl);
13849 cp_cv_quals quals = type_memfn_quals (stype);
13851 if (quals != TYPE_UNQUALIFIED)
13852 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13854 TREE_TYPE (decl) = stype;
13856 if (DECL_ARGUMENTS (decl))
13857 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13858 DECL_STATIC_FUNCTION_P (decl) = 1;
13861 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13862 one of the language-independent trees. */
13864 enum cp_tree_node_structure_enum
13865 cp_tree_node_structure (union lang_tree_node * t)
13867 switch (TREE_CODE (&t->generic))
13869 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13870 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13871 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13872 case OVERLOAD: return TS_CP_OVERLOAD;
13873 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13874 case PTRMEM_CST: return TS_CP_PTRMEM;
13875 case BASELINK: return TS_CP_BASELINK;
13876 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13877 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13878 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13879 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13880 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13881 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13882 default: return TS_CP_GENERIC;
13886 /* Build the void_list_node (void_type_node having been created). */
13888 build_void_list_node (void)
13890 tree t = build_tree_list (NULL_TREE, void_type_node);
13895 cp_missing_noreturn_ok_p (tree decl)
13897 /* A missing noreturn is ok for the `main' function. */
13898 return DECL_MAIN_P (decl);
13901 /* Return the COMDAT group into which DECL should be placed. */
13904 cxx_comdat_group (tree decl)
13908 /* Virtual tables, construction virtual tables, and virtual table
13909 tables all go in a single COMDAT group, named after the primary
13911 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13912 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13913 /* For all other DECLs, the COMDAT group is the mangled name of the
13914 declaration itself. */
13917 while (DECL_THUNK_P (decl))
13919 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13920 into the same section as the target function. In that case
13921 we must return target's name. */
13922 tree target = THUNK_TARGET (decl);
13923 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13924 && DECL_SECTION_NAME (target) != NULL
13925 && DECL_ONE_ONLY (target))
13930 name = DECL_ASSEMBLER_NAME (decl);
13936 #include "gt-cp-decl.h"